r,GG OUNITIIOLOGY. 



June, following-, t\'C found it abundant in a veiy similar portion of the 

 valley of Canson River; they were observed early in the morning, hovcriu}^ 

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

 Ilawks {Chordciles), but in their flight resembling the Chimney Swifts 

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

 dili'erence 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 foce of a high 

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

 account of tlie shortness of our stay. They were perfectly silent duruig 

 the whole time they were observed. 



List of specimens, 



807, wings, tiiil, feet, and sternum; Truckee Reservation, May 31, 1868. (Found 

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



'i CniETUEA VAUXI. 

 Oregon SwilC. 



Ci/pnelus rauxii, ToWNSEND, Journ. Acad. Nat. Sci. Philad., VIII, 1S.30, MS. 

 Cluctura vavxii, DeKay, ZdoI. New York, 11, 1844, 30.— Daiud, Birds N. Am., 



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



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



Birds N.W., 1874, 208. 

 Chaitura {pelagica var.?) vattjci, B. B. & E., Hist. N.Am. Birds, II, 1874, 435, pi. 



XLV, fig. 8. 



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

 in May and June, 18G8, we saw, nearly every evening, but never until 

 after sundown, quite a number of small Swifts which must have been this 

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

 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 Chimney Swift {G. jjc/flf.^/ca), but they differed in their entirely 

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

 in particular being a very marked difference from the eastern species. 



