Petrochelidon lunifrons. Lake Umbagog. Colony of Eave Swallows at Errol Dam. 1903 June 15 (2) Mrs. Allen told me that the birds have nested on the barn ever since she and her husband have had charge of the place (about sixteen years) but that they have increased rapidly in numbers during the past few years. She also said that this was the first season when any of them have attempted to build under the eaves of the long shed over the dam itself. The nests have a secure foundation there as well as in the gable end of the barn. Nearly all the finished nests were of the old-fashioned type, i.e. with well marked bottle necks. The same thing is true of the nests I have examined lately (during the past week) at "Popple" Tavern and Upton. It is evident that the birds have increased and spread throughout the Lake Region of recent years. The Allens tell me that a large colony has become established at Middle Dam. Despite the unusual number of nests at Errol Dam there were seldom more than thirty or forty birds in sight there at any one time to-day. Others were coming and going continually, however, and a considerable proportion of the total number seen were usually collected about a puddle of rain water in the road, collecting mud for their nests. 25