8 UPTON, MAINE 1871 entirely replaced by its prototype H.perigrina. 34. Helminthrophaga perigrina. Very common, found everywhere in the woods, but especially partial to cedar swamps and thick-ets of tall firs: kept always high up in the tree tops and was very restless, frequently taking long flights. Sang at all times of the day: its note was very like that of H.ruficapilla but more prolonged shrill and rapid and frequently it would re-peal it a number of times in succession without the slightest pause until it seemed wonderful that the bird could take breath: it had also a habit of singing on wing especially just as it was coming down from a long flight. The female had a sharp chirp precisely like that of H.ruficapilla: they usually kept rather nearer the ground than the males, where they undoubtedly bred: shot a female June 7th that had commenced incubation and others previously that had laid all but one or two eggs: were not fortunate enough however to find the nest. 35. Sierus aurocapillus. Found sparingly in the woods. 36. Sierus noveboracensis. Rather scarce: heard them occa-sionally in the swampy thickets. 37. Dendroica virens, Not common in the woods. 38. D.caerulescens. Rather scarce in the heavy timber. 39. D.coronata. Quite common in the fir thickets. Found it breeding in an old pasture grown up to small firs. Three nests found June 8th and 9th were built about breast high in a fir savin and contained four eggs each, all far advanced towards incubation. The nests were all quite large, deeply hollowed and lined principally with feather.