BIRDS OF NORTH AND MIDDLE AMERICA. 507 



CHORDEILES VIRGINIANUS HESPERIS Grinnell. 



PACIFIC NIGHTHAWK. 



Similar to C. v. virginianus, but adult male with general coloration 

 lighter, the upper parts with the dusky ground color more brownish 

 black, the lighter markings more numerous, especially on back, scap- 

 ulars, proximal secondaries, and wmg-coverts, the posterior under 

 parts less tinged with buff and with the dark bars averaging narrower. 



Adult male. — Length (before skinning), 221-260 (240.5);° wing, 

 183-211 (200); taH, 107-120 (112.9); exposed culmen, 6-8 (6.9); 

 tarsus, 13.8-15.2 (14.3); middle toe, 14-15.5 (14.7).^ 



Adult female. — Length (before skinning), 232-241 (236.5);° wing, 

 187-203 (194.9); taU, 105-119 (112.2); exposed culmen, 6.1-8 (7); 

 tarsus, 13-15.2 (14.5); middle toe, 14.2-16 (15.3).^' 



Pacific coast district and eastward to Rocky Mountains, from 

 southern California, Nevada, and Utah northward to Washington 

 (FortSteilacoom; Aberdeen; Grays Harbor; BellinghamBay; Puget 

 Sound; Rockland), southeastern British Columbia (Trail), southern 

 Alberta (Many Island Lake, near Walsh), and southwestern Sas- 

 katchewan (Indian Head ; Maple Creek; Hay Creek; Big Stick Lake) ; 

 eastward to central Montana (Bozeman; Great Falls; Milk River; 

 Sun River; Johnson Lake; Cameron County; Gallatin County; 

 Dawson County; Powell County; CorvalHs; Bear Paw Mountams) 

 and northeastern Wyoming (Upper Geyser Basin; Stinking Creek; 

 GreybuU; Saratoga), migrating southward through Colorado, New 

 Mexico, Texas, Arizona, Mexico, etc., to Nicaragua (Rio Escondido, 

 Oct. 28). 



Chordeiles virginianus (not Caprimulgus virginianus Gmelin) Newberry, Rep. 

 Pacific R. R. Surv., iv, pt. iv, chap, ii, 1857, 78 (San Francisco, California, 

 to Columbia R.). — Coues, Check List, 1873, no. 267, part. — Merrill (J. C), 

 Auk, V, 1888, 256 (Ft. Klamath, Oregon).— Brewster, Auk, v, 1888. 256 

 (Ft. Klamath; crit.).— Grinnell (J.), Pub. 2, Pasadena Ac. Sci., 1898, 26 

 (Los Angeles Co., rare migrant). 



[Chordeiles] virginianus Coues, Key N. Am. Birds, 1872, 181, part. 



[Chordeiles virginianus] a. virginianus Coues, Birds Northwest, 1874, 263, part. 



(?) Chordeiles virginianus virginianus Grinnell, Pacific Coast Avifauna, no. 3, 

 1902, 40 (California range). 



Chordeiles popetue (not Caprimulgus popetue Vieillot) Baird, Rep. Pacific R. R. 

 Surv., ix, 1858, 151, part (Fort Steilacoom, Washington; Cosumnes R. and 

 Tulare Valley, California); Cat. N. Am. Birds, 1859, no. 114, part.— Heer- 

 MANN, Rep. Pacific R. R. Surv.,x, pt. iv,no. 2, 1859, 35, part (California).— 

 Cooper and Suckley, Rep. Pacific R. R. Surv., xii, book ii, pt. iii, I860,, 

 166, part, at least (Puget Sound, Vancouver?, Fort Dallas, and Fort Steilacoom, 

 Washington).— Cooper, Orn. CaUf., 1870, 343 (excl. syn. part).— Allen, 

 Bull. Mus. Comp. Zool., iii, 1872, 169 (Ogden, Utah).— Belding, Proc. U.S. 

 Nat. Mus., i, 1879, 427 (Soda Springs and Big Trees, California). 



o Two specimens. ^ Ten specimens. 



