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Chordeiles virginianus. Maine (Lake Umbagog). 1876. May 31. Unusual numbers this evening visiting the patch of freshly-turned earth in the garden. They would sweep in just above the fence, and after skimming close over the surface of the ground would make a half wheel and alight. Sometimes as many as three or four would pitch down together. I watched they very carefully and was satisfied that they were catching insects. When one alighted it would sit motionless for a moment with head and neot stretched p to an astonishing height and then bob its head up and downa number of times much in the manner of a Screech Owl, and finally, if all remained quiet, make a short run and pick up something from the freshly-turned earth. Those runs were made very quick- ly, though awkwardly. Not infrequently the bird would (May 31) over on its head and flutter clumsily to regain its balance. They reminded me of so many great toads and picked up insects in nearly the same way. I noticed that they carried their tails raised like Terns and the tips of their wings trailing. All that came to the gar- den were females: the males meanwhile were booming high in air over Cambridge River. June 4. Seating myself on the edge of the beds in the gar- den this evening I waited the coming of the Night Hawks. In a few minutes they began to arrive and for sometime were continually coming and going. Each individual re- mained only a minute or two and there were rarely more than three or four on the ground at one time. Several alighted within six feet of me and I found that I could move abouta little without attracting their notice. One which I started suddenly uttered a clucking whuk, whuk. Their gait when walking slowly was todling and feeble. As on previous occasions they seemed to be picking up insects from the freshly turned earth; but if this is really their occupation I cannot imagine why the males do not also come as they certainly never do. " 5. Mr. William Stone brought me a fine adult male Night Hawk which he shot as it staradd off its egg. He did not see the female. The locality was a small clearing grown up with low bushes. The egg lay on a mound which was nearly surrounded by water.
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Chordeiles popetue. 1879. Maine (Lake Umbagog). May 24. One booming over the lake this evening. " 25. Abundant this evening, the males booming in all directions. June 22. Watched a male closely this evening. He worked his way skyward by jerky, moth-like flights until an elevation of several hundred feet had been reached when he set his wings and dove earthward. When within about forty feet of the ground--the distance varying somewhat on different occasions--the tips of his wings were suddenly turned forward and at the same time the remarkable ripping "boom" was heard. The connection at this alteration in the angle at which the wings were held and the production of the sound was too obvious to admit of any doubt that the latter was caused by the wings, instead of being vocal. He invariably came down over the same spot though from various starting points, and I was not surprised when, a little later, the female rose from the ground at the termination of one of his plunges and skimmed off close over the ground, the male following her closely. June 23 I visited the spot about noonday and started the female. She pretended lameness, and tried all her arts to lead me away from the place, so that I felt sure that she had either eggs or young, but on the scorched and blackened ground I could not find them. 1880. May 20. Numbers. June 4. Dozens flying about this evening, mostly in pairs. The males would mount hundreds of feet in the air and then dive down after the flying female overtaking and brushing past them within a few inches, at the same time "booming". 1881. May 14. One booming this evening. " 16. Had a good chance this evening to compare the note of the Nighthawk with that of the Woodcock. They are wonderfully alike but the Woodcock's cry is feebler and cannot be heard more than fifty to a hundred yards. " 29. Nighthawks came around the house in great numbers this evening sealing through the dooryard close to the ground, and alighting in Mr.Abbott's garden as they always do at this season.
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Chaetura pelagica. Maine (Lake Umbagog). 1873. Sept 8. Saw a single bird flying over Richardson Lake at sunset. Have seen none before for at least a week past. 1874. Aug. 8. Still here. “ 24. In the deserted barn at the Cross place I heard several Chimney Swifts twittering after dark on the evening of August 15. Inspecting the premises this morning I found one of their nests built in the end of the barn near the ridge poll. It was glued to the vertical face of the boards, and was precisely similar in every way to chimney nests. 1879. May 21. Late this afternoon saw Chimney Swifts collecting from all directions and swooping about the chimneys on a house on Bathol hill. The throng increased rapidly, until a large troop was circling about the house in a huge endless ring. As it grew darker their anxious manner and incessant twittering showed their impatience to get to bed, and they began to drop into one of the chimneys, a tall slender one of modern shape. At first, indeed for many minutes, the majority failed in this attempt. They would somehow miss the mouth of the chimney and scale off to speedily return and try it over again. As it grew darker they seemed to become more successful and at length nearly the whole troupe poured down into the chimney in a continuous stream that seemed as if it must fill the space within to overflowing. There were at least two hundred birds in all. June 15. Alva Coolidge tells me that in 1877, he took a set of eggs from a nest built in a tall dead stub near the Outlet. He discovered it by seeing the birds fly into the hole which was a natural one of rather large size, entering the side of the trunk. The nest was constructed in the usual manner and was glued to the inside of the cavity against the wood. A pair of these Swifts are at present building in a car enters shop near the mill, attaching their nest to the boards directly over the work bench..
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Trochilus colubris. Naino (Lake Umbagog). 1871. May 30- June 10. Rather common, breeding. 1872. June 3- 14. Quite common. Their courtships which we observed frequently are most interesting. The male poising about ten feet above the spot where they female is sit- ting darts down at an angle of about 45°, and passing an inch or two above her, rises on the opposite side, turns, poises a moment, and plunges again, repeating his shrill chirp incessantly. This is kept up for a minute or more when he either flies off, or settles lightly on some twig near his mate. 1874. Aug. 5. Shot a young bird in fall plumage. It was sitting on the top of a high spruce and kept up an incessant shrill scoop a note which I have never heard the bird utter before. " 21. They have become very abundant within a few days, " 24. One poised for a moment within a few inches of a sleeve of a bright-colored cardigan jacket which I was wearing, evidently taking this garment for a bank of brilliant flowers. This has happened to me once before recently. In neither case did the bird seem to discover its mistake until I moved slightly and frightened it. 1879. May 22. The Canada plum trees in the garden are in full bloom and their snowy mass of blossoms seems to have attracted all the Hummingbirds of this region. A per- feet swarm of them was collected there to-day; more than I ever say together before. One small but very full- blossomed tree seemed especially favored and there must have been at least twenty Hummingbirds about it at once, the sound of their wings producing an incessant humming like that of a swarm of bees. They were very tame per- mitting me to approach within five or six feet I think they spent the night in this particular tree for upon visiting it after it had become nearly dark I made out several perched among the slender twigs, their lit- tle forms distinctly outlined against the sky.
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Trochilus colubris. Maine (Lake Umbagog). 1879. May 23. As last night was clear, cold and accompanied by a frost which is said to have killed much of the corn in the surrounding country I feared for the safety of the Hummingbirds left in the orchard last evening. But up- on visiting the place this morning I found them apparent- ly uninjured and in even greater numbers than before. Many were buzzing about sipping the honey from the blos- soms, while others were sunning themselves under the lee of the trees, perched on wood stalks within a few inches of the ground. One and all seemed somewhat numbed by (May 23) the cold, and each little form was so puffed up, that it looked like a ball of down. As the sun rose higher they resumed their characteristic nervous energy and the snowy canopies of blossoms witnessed many a spirited con- test between the pugnacious males. The females were in about the proportion of one to four females. The males paid them little attention devoting most of their time to feeding, and quarrelling with one another. They are evidently not yet paired. I heard only two notes a sharp squeak and an exceedingly fine twittering. Their fights were most entertaining being spirited and decisive to a degree; sometimes the combatants would cone to the ground clinched together and when the weaker gave way and fled there was always a sharp pursuit. The orchard was filled with their shrill squeaking and the hum of their tiny wings was incessant. What a pity that a scene so interesting must be so transient. In a day or two the blossoms will fall and then another year must pass before the plum orchard will be again re- visited by these charming little sprites. " 24. The plum trees showering down their faded petals and the Hummers nearly all gone, only one or two lingering about the scene of their late revels . June 5. A common resident; I see them daily. 1880. May 18. One poising in front of a few freshly-opened blos- soms of the Canada plum-tree in the garden. 1881. May 20. One darting like a bee across Leonard's Pond. It is in advance of the season for the Canada plum trees will not bloom for several days yet.
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Tyrannus carolinensis. Maine (Lake Umbagog). 1873. Aug. 27. While coming down the Lake about 10 P.M. a Kingbird came overhead, invisible, of course, for it was very dark but uttering his unmistakable cry incessantly. 1876. June 10. A nest neatly finished in the hollow top of a stub. " 17. A nest in the top of a hollow stub contained two fresh eggs. " 18. Nest in a hollow stub with three eggs. " 21. Two nests, one with three and the other with two eggs; the former set was incubated several days; the latter contained the same number of eggs since the 18th. " " Two nests built in the top of hollow stubs, the jagged edges of the shell of the stub just rising above the rim of the nest and failing to entirely conceal its exterior. The old birds very bold, diving down at me and snapping their bills. " 22. E-3. A nest found three days ago contained three eggs; the number had not been increased to-day. I think the Kingbird rarely lays more than three eggs here. 1879. June 5. A pair at work upon a nest about five feet above the water in a low stub; the female making frequent trips for usnea moss, the male invariably accompanying her but otherwise rendering no assistance. " 13. G-4. Set of four eggs incubated about two days. Nest in top of hollow stub two feet above the water of the Lake; it was found June 5 when the female was building. " 19. Set H-4. Fresh--hollow stub over water--height six feet. " 20. Set I-3. In top of stub over water. coll O.J. Morse. 1 egg about 7 days, 2 eggs added.
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Tyrannus tyrannus 1897. Lake Umbagog. S. P. = Leonard's Pond O. = Outlet. May 14-17 (Billings) 22 30 31 3 Near Ballston " " S. P. Botts Brook. S.W. to F. O. June 1-2 Pond - 4-5 6 7 2 hours & 2 Outlet. June 15 midway between Dixville Notch and Colebrook, N.H., I saw a Kingbird sitting on a dead tree. Three Goldfinches alighted on a branch beneath him. The Kingbird at once swooped down at them when they flitted off in different directions, evidently much frightened. The Kingbird pursued one of them with the utmost energy and determination to outstrip it equal to that of a hungry Peregrine Hawk and at a scarcely less rapid rate of speed. Indeed it overtook the Goldfinch with the utmost ease but the latter, resorting to the tactics adopted by most small birds under similar circumstances doubled & thus gained some slight ground. Shortly every time its pursuer came up with it this was repeated from times in quick succession. Then the chase passed beyond my view behind some large trees & I do not know how it ended but at the last the Goldfinch seemed to be following the Kingbird to be on the point of seizing it. Scarcely a minute further on I saw another Kingbird attack and give chase to a Flicker which alighted on the ground near a fence on which the Kingbird was sitting. Here again the two birds disappeared just as the Kingbird was outstripping the Flicker. 1903 June 4' 5² 6² 7³ 10² Bethel. " 9⁴ Norway " 11⁸ Bethel to Upton, " 12² / 13² 14³ Flooded meadows mouth of Candady Run, Upton. 38
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Myiarchus crinitus. Maine (Lake Umbagog). 1876. June 1. Saw a pair and one single bird along the path to the Stone Farm; they were noisy, as usual, and very shy. " 3. One among the flooded forest of stubs at the Outlet. " 18. Heard one near the post-office on Upton Hill. " 14. One calling behind the barn all day long. " 17. Heard them everywhere about the shores of the lake. They are fully as common here now as the Olive-sided Fly- catcher. " 19. Mr. Purdie who returned to-day from the Megalloway tells me that this species was rather common about the lower settlement. 1878. May 24. One in the woods behind the Lake House. June 1. As in 1876 this Flycatcher is fairly abundant along the shores wherever there are plenty of dead stubs; nor is it wanting upon higher ground, for I heard one this af- ternoon at least a half a mile from the Lake on Upton Hill. Although it was certainly a rare bird here in 1871-2 it is now, in suitable localities, nearly as com- mon as Contopus borealis. " 5. One entered a natural hole in an ash stub about fifty feet above the water. At least six pairs seen to-day. 1880. May 21. One, the first. June 9. Set B-5. Incubated three days--solitary stub sur- rounded by water four rods from shore; nest about twelve inches below entrance, which was an old knothole large enough to admit the hand; height ten feet; female sitting. She flew from the hole before we were within gun shot. Her cries summoned the male but both were very shy, rarely coming within gun range. They made less noise than I expected. 1881. May 13. Seen to-day. Alva Coolidge says that they were yester- day.
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Nuttallornis borealis. Maine (Lake Umbagog). 1879. May 24. Several males near the Lake House calling from the tops of stubs. " 30. Fully as abundant as during former years. We heard them continually yesterday during our trip up Cambridge River to the Sluice. In Belknap's "List of the Birds of Central California", it is said that the hunters of that state, liken the ordinary note of this bird to the words "three deer". Upon repeating this to one of the guides yesterday he at once recognized the resemblance (which must indeed, strike evryone) and further extended the exclamation by suggesting the addition of the word "look" to represent the gluck which almost invariably precedes the utterance. This fine Flycatcher is remarkable for its fondness for some particular perch usually the highest point in the neighborhood. In the woods bordering the Cambridge, this is most commonly the topmost pinnacle of some tall fir. Upon a dead tree-top behind the Lake House one of those birds sits through the entire day. This morning I heard him utter a note that I do not remember to have heard before; it was a querulous, whirring sound very like that produced by Empidonax acadicus. This note is apparently most frequently used by the Olive-sided Flycatcher when two males are fighting, or when a male and female meet_it_is_difficult_to-say-which_as_the-opposite sexes even when mated are continually quarrelling. Contopus borealis. Maine (Lake Umbagog). 1879. (June 23) Set B-1. Incubated about three days. The female was sitting and probably would have laid no more eggs. Horizontal branch of tall spruce on edge of woods--height fifty feet. I found this nest by watching the birds and saw the female go to it. The male drove away every bird that came near the tree, among others a Hairy Woodpecker which was fiercely assailed and ignominiously put to flight. The female was sitting to-day; she left the nest when my guide began to climb the tree and with her mate darted down about his head, both birds snapping their bills and keeping up a great outcry. [The ers in bar]
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Nuttallornis borealis. Maine (Lake Umbagog). 1880. May 20. Sevoral. June 11. A newly finished nest in a spruce. The old birds dove down about my climber's head although the nest was empty. " 14. Set C-4. Incubated four days; horizontal branch of tall, slender spruce, near extremity and about four feet from the trunk; height forty feet; female sitting. As we landed near the spot she left the nest and joined her mate, both birds uttering their anxious pill-pill- pill. Upon our withdrawing a little distance she re- turned to the nest, again leaving it when my guide began to climb the tree. Neither of these birds came very near while he was taking the eggs. S. Elwyn B. Evans. " 16. Set D-3. Incubated three days; near extremity of horizontal branch of black spruce, eight feet from trunk; height twenty-five feet; female sitting; she flew off when we rapped on the tree and alighted on a dead branch near sat in perfect silence while we took the nest and eggs. The male did not appear and I have seldom heard him near this nest which was immediately behind the Lake House. " " Set E-3. Fresh--extremity of short horizontal branch of exceedingly tall black spruce, three feet from trunk; height forty-five feet; female sitting; when my guide ascended the tree both she and the male swooped about his head "snapping their teeth". Point east of Stone farm. " 19. Set F-3. Fresh--near extremity of horizontal branch of black spruce, midway between ground and top of tree which was a tall slender one; height twenty feet; fe- male sitting; we rapped sharply on the tree without starting her nor did she leave the nest till my guide had nearly reached it. She then flew to an adjoining tree where, with the male, she kept calling pill-pill-pill, but neither bird plunged about the climber's head nor snapped their bills. 1881. May 14. Saw five, the first. 59
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Empidonax flaviventris. Maine (Lake Umbagog). 1871. May 30- June 10. Took five specimens during our stay, these were all that were seen. They were found in dense, gloomy arbor- vitae swamps where their presence was usually betrayed by their low pco-o. Mr. Maynard also heard both sexes singing; their note sounded to him like the word killink. Any sudden noise, such as the cracking of a branch or the report of a gun, seems to excite rather than to alarm them and frequently on such occasions they will fly to the spot as if impelled by curiosity. 1872. June 3- 14. Found generally throughout the arbor-vitae swamps but rather more numerous in the willow and viburnum thick- etsbordering Cambridge River. What seems to be the song of the male is a short, feeble sl-at which appar- ently corresponds to the chelat of the Least Flycatcher. 1873. Aug. 29. Heard a number to-day in the swampy woods bordering Cambridge River. 1874. Aug. 3. Two young just from the nest were sitting side by side on the branch of a viburnum overhanging Cambridge River, uttering a juvenile version of the sl-at of the adult. 1876. June 14. Very abundant along the Tyler road the males sing- ing everywhere. The song is like that of the Least Fly- catcher in tone, but in general character perhaps more like the sl-ip of Henslow's Bunting. It may be closely imitated-by the syllables sl-at with the accent on the last. 1879. May 29. About six heard along Cambridge River. The song may be best described by the word: chebec, though it dif- fers from the chebec of E.minimus in being feebler and hoarser. June 14. The song note is ch-lat. 1880. May 20. Several. 1881. May 18. One, the first this year.
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Empidonax flaviventris. ANOTHER NEST OF THE YELLOW-BELLIED FLYCATCHER (Empido- nax flaviventris). — In view of the seeming inconsistencies in the nesting habits of E. flaviventris, the record of the finding of another nest may be of interest. The locality was the Richardson Lakes, Oxford Co., Me.; the date, June 18, 1879; and the discovery was very similar to that of the nest which I secured last year at Grand Menan, and which is described in Vol. III, No. 4, of this Bulletin. Mr. Pearsall and myself were collecting in a tract of low swampy woods bordering on a stream, when a Yellow-bellied Flycatcher flew up from under my feet. An instant's search revealed the nest, when the parent bird was immediately shot. The nest was built in the side of a hummock of moss under the roots of a small tree, and was only about half covered over, the eggs being clearly visible from the outside. The construction, or rather the almost total lack of construction, was similar to that of the Grand Menan specimen, as were also the eggs, which were four in number and pretty well advanced in incubation. Does not this seem to argue something for uniformity in the breeding habits of this bird? Here we have three nests, one taken by Messrs. Purdie and Deane, and two by Mr. Pearsall and myself. The locations are quite far apart, viz. Houlton, Me., Grand Menan, N. B., and Richardson Lakes, Me.; and yet the situation and make of the nests, as well as the color and markings of the eggs, agree perfectly. In both cases which I have recorded the identity was beyond all question, as I found both nests myself, and the birds were never lost sight of from the time they left the nests until they were in our possession. Ornithologists may draw what inferences they please from these facts, but to my mind they augur ill for the identity of those nests which have been found in bushes, built of stubble, etc., and containing pure white eggs. — S. D. OSBORNE, Brooklyn, N. Y. Bull. N. O. O. 4, Oct., 1879, p. 240-241.
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Empidonax traillii alnorum. Empidonax trailli. Maine (Lake Umbagog). 1872. June 3- 14. Near the top of Upton Hill we found these Flycatch- ers abundant. One locality, comprising about three acres of alder thickets fringed about the edges with scattered poplars, literally swarmed with them, and af- ter twenty had been shot there their numbers were not appreciably diminished. Although at this time they were evidently settled for the season, they had not apparently, begun to breed, but last year's nest were found in abundance. These Flycatchers are very quarrel- some, fighting fiercely with each other, and driving all other birds from their retreats. They keep low down in the bushes, frequently perching not more than six inches above the ground. They appeared to catch flying insects less often than do other Empidonaces. They are very shy, and when pursued usually flit on ahead keeping near the ground and just out of range. Often one will start as if to fly only a few yards but really go the whole length of the thicket. This trick was noticed repeated- ly. They also have a habit of alighting with their backs towards the pursuer; nine out of ten were shot in the back. Their notes are numerous and uttered almost incessantly. What seems to be the song of the male is an emphatic quee-wooohy or quee-wench, sometimes Queo- quoah. The ordinary cry of both sexes is a petulant pip sometimes repeated several times in quick succession. They also utter an angry, querulous twitter, especially when fighting. When their retreats are invaded those in the immediate neighborhood become at once silent, although the report of a gun does not seem to alarm them. The males sing indifferently from the depths of the thicket or from the tops of the higher alders. Although they sometimes perch on the branches of trees overhead, they rarely sing in such situations. On June 9 we found Traill's Flycatchers numerous in the willow thickets along the edges of B Meadow, A female was seen building there. Nest A/3, (1839), June 27, 1873, Upton, coll. Wm.Brewster. Female started off nest & shot. In up- right fork of water willow 12 in.up. Bushy thicket sloping down to the lake shore. Eggs slightly incubated.
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Empidonax traillii alnorum. Maine (Lake Umbagog). 1974. (1) July 31. Shot one of a brood of several young. Although barely large enough to fly and still being fed by their parents, they called quoo-wichy exactly like the adults and kept darting up after flies. Aug. 4. Saw a number (all adults) on Upton Hill. (2) " 6. Found a brood of young in a thicket of low bushes. They called quoo-wichy in exactly the tone of the adult. The mother flitted nervously about uttering the usual pip of alarm. 1879. (3) May 29. Abundant among the alder thickets bordering B Meadows. 1876. June 17. A completed but empty nest at least ten feet above the ground in a spruce. 1879. (June 21.) Set D-4. Fresh--hardhack--two foot-- bird absent nest so conspicuous that I saw it thirty foot away. " " Set E-3--Fresh--in fort of willow--supporting branches at least one and one half inches in diameter--edge of thicket of mixed willows and young spruces on hillside--height three feet. Birds piping near the place but female absent. " " Set F-3. Incubated about three days--wild raspberry bush--two feet--nest effectually concealed--female sitting--flushed directly under my feet--shy but flitting around uttering her characteristic pip.. " " In addition to the nests just mentioned I found two others--one building, the other containing a single egg--both in hardhack bushes and not over two foot high; they were very conspicuous. " 23. A recently completed but empty nest on the Stone Farm. " " Set G-3. Fresh--hardhack--height three foot-- bird absent--edge of opening in second-growth birch maple and birch thicket--nest found June 21 when it contained one egg.
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Empidonax traillii alnorum. THE NEST AND EGGS OF TRAILL'S FLYCATCHER, AS OBSERVED IN MAINE.—The structure of the nest, its situation, and the eggs of this species (Empidonax traillii), as found in the above-named State, are all quite different from Mr. H. W. Henshaw's description of them, as given in the first number of this “Bulletin.” The nest is built between the upright shoots of low bushes, from one to five feet from the ground, and is loosely constructed of grasses throughout, including the lining. It is a much less compact nest even than that of the Indigo Bird, though perhaps smaller in the average. The eggs are of a pale creamy white, with red- dish-brown dots, spots, or blotches of two shades, disposed chiefly about the larger end. This brief account is based on specimens obtained about Lake Umbagog, Upton, and at Bethel, Maine, by Messrs. William Brewster and H. B. Bailey, and at Gorham, N. H., by Messrs. George Welch and Duxbury Moon. I have lately seen nests and eggs of both E. acadicus and E. traillii collected at Columbus, Ohio, by Dr. J. M. Wheaton. Sin- gularly enough, that of the former (E. acadicus) bears a close resemblance in its structure to that of Maine specimens of Traill's Flycatcher, while the compact felted character of the latter (E. traillii) is entirely unlike any nest of this species from the Canadian fauna. The eggs of the Ohio nests are in each case of a decided buff color as compared with Northern ones. In this connection I would ask if it has been observed whether the ground color and markings of the eggs of species breeding in northern latitudes are of a lighter tint than those of the same kind laid in austral limits,—that is, does intensity of color hold good in eggs as it does in plumage ? — H. A. PURDIE. Bull. N.O.C. I, Sept. 1876. p. 75-76.
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Empidonax Traillii alnorum - Notes on Certain Flycatchers of the Genus Empidonax. by Wm B Brewster. Empidonax traillii alnorum, new subspecies. ALDER FLY- CATCHER. Auk, XII, Apr., 1895, pp. 161-3. Subspec. char.—Differing from E. traillii (i. e., E. “pusillus” of Baird and subsequent authors) in having the coloring of the upper parts richer and more olivaceous, the wing bands yellower and hence more conspicu- ous, the bill decidedly smaller and the legs rather shorter. Type No. 1367, collection W. B. & ad., Upton, Maine, June 3, 1872. There is of course nothing new about this separation or the characters on which it is based. Indeed, all of the latter — as 21 Baird apparently did not have the Audubonian specimens before him when he made the comparison of traillii and pusillus above referred to. At least he does not allude to them in the text nor are they included in his tabular lists. The series of what he con- sidered to be true traillii comprised nine examples, of which one came from New Hampshire, seven from Carlisle, Pennsylvania, and one from Mexico. The Carlisle birds were all taken in May and were unquestionably migrants on their way to northern New England or New York. Hence it is evident that his impressions of traillii were based on material which did not really represent that bird. I must confess to a certain sense of relief that, as has been just shown, the responsibility for the above separation rests mainly on shoulders other and broader than mine; for while I honestly believe it to be based on intrinsically sound characters, the differences between the two birds in question are, after all, so slight and so difficult of verification without the aid of large series of specimens for comparison that the identification of individual specimens by descriptions alone is an almost hopeless task. This, however, is by no means a novel condition among Empidonaces, for this puzzling group includes several forms which are positively known to be distinct species, but which in the dried skins cannot always be distinguished with either ease or certainty. The respective breeding ranges of E. traillii and E. t. alnorum cannot be mapped at present with entire precision, but I have had no hesitation in referring to the former all the breeding specimens that I have examined from the Mississippi Valley south of the 42nd parallel of latitude, and from North America at large west of the Plains, including skins from Fort Resolution on Great Slave