r)GG OllNITnOLOGY. 



June, following, we found It abundant in a vevy similar portion of the 

 valley of Carson River; they were observed early in the morning, hovering 

 over the cotton-wood groves in a large SAvarm, after the manner of Night- 

 Ilawks {Chordcih's), but in their flight resembling the Chimney Swifts 

 {Chcetura), as they also did in their uniform dusky color, the chief apparent 

 difference being their much larger size. They were evidently breeding in 

 the locality, but whether their nests were in the hollow cotton-wood trees of 

 the extensive groves along the river, or in crevices on the face of a high 

 clilf which fronted the river near by, we were unable to determine on 

 account of the shortness of our stay. They were perfectly silent durijig 

 the Avholo time they were observed. 



Lht of specimens. 



807, wings, tail, feet, and sternum; Truckee Reservation, May 31, 18CS. (Found 

 on a log iu the woods, where left by a hawk or owl.) 



i Cn.ETUTtA VAUXI. 



Oregon Swill. 



Cfipuvlus vauxii, Townsend, Journ. Acad. Nat. Sci. Pbilad., VIII, 1839, MS. 

 Chwtura vmuii, DeKay, Zool. New York, IE, 1844, 36.— Baird, Birds N. Am., 



1858, 145; ed. ISGO, pi. 18; Cat. N. Am. Birds, 1859, No. 110.— Coopeu, 



Orn. Cal., I, 1870, 351.— CoUES, Key, 1872, 183; Check List, 1873, No. 272; 



Birds N.W., 1874, 268. 

 Chcetura {pelagka var.?) vaiui, B. B. & R., Hist. N. Am. Birds, U, 1874, 435, pi. 



XLV, fig. 8. 



During our sojourn at the Truckee Reservation, near Pyramid Lake, 

 in May and June, 18(jS, we saw, nearly every evening, but never until 

 after sundown, (piite a number of small Swifts Avhich must have been this 

 species; but they always flew at so great a height that we found it impos- 

 sible to obtain a specimen in order to determine the species. In appear- 

 ance, manner of flight, and, apparently, in size also, they resembled the 

 eastern Chinmey Swift {C. pclafjUxi), but they differed in their entirely 

 crepuscular habits, and the fact that they were perfectly silent — the latter 

 iu particular being a very marked dift'erence from the eastern species. 



