272 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



16. — Baird, Cat. North Amer. Birds, 1859, No. 29. — Cooper and Sucklet, 

 Rep. Pacific R. R. Surv., x, book 2, pt. 3, 1860, 148, pi. 16 (descr., etc.).— 

 Bryant, Proc. Boston Soc. Nat. Hist., viii, 1861, 113 (crit.). — Gray, Hand- 

 list, i, 1869, 8, No. 56. — Cooper, Orn. California, Land Birds, 1870, 472 

 (Mountain View, Santa Clara Valley, Calif.; crit.). — Coues, Key North 

 Amer. Birds, 1872, 216; Check List, North Amer. Birds, 1873, No. 349.— 

 RiDGWAT, in Baird, Brewer, and Ridgway, Hist. North Amer. Birds, iii, 

 1874, 295; Auk, i, 1884, 253, 254 (crit.) ; ii, 1885, 165, 166 (crit.); Man. North 

 Amer. Birds, 1887, 230; ed. 2, 1896, 230.— Sharpe, Cat. Birds Brit. Mus., i, 

 1874, 172, footnote; Hand-list, i, 1899, 246. — Gurnet, List Diurn. Birds 

 Prey, 1884, 66. — American Ornithologists' Union, Check-list, 1886, 353 

 (hypothetical list. No. 14); ed. 2, 1895, 329 (hypothetical list. No. 14); ed. 3, 

 1910, 372. — Fisher, Hawks and Owls United States, 1893, 79. — Brewster, 

 Mem. Nuttall Orn. Club, No. 4, 1906, 186, 187 (Cambridge, Mass.; spec. 

 Nov.). — SwANN, Synopt. List Accip., pt. 2, 1919, 49. — Palmer, Condor, 

 XXX, 1928, 272, in text. — Grinnell, Condor, xxxii, 1930, 259 (syst.; crit.); 

 Univ. Cahfornia Publ. Zool., xxxviii, 1932, 266 (type loc; crit.). 



Buteo cooperi ? Coues, Key North Amer. Birds, ed. 2, 1884, 543. 



Tachytriorchis cooperi Goode, U. S. Nat. Mus. Bull. 20, 1883, 345. 



BUTEO GALAPAGOENSIS (Gould) 



GalXpagos Hawk 



Adult (sexes alike in color), — Nearly uniform dark sooty brown, 

 inclining to brownish black on head, lighter and tinged with rusty on 

 sides, flanks, abdomen, and tibiae, where the feathers have more or 

 less distinct terminal margins of lighter brown; under tail coverts 

 with broad white bars, mostly concealed, except on longer feathers, 

 where the whitish bars nearly equal the dark brown interspaces in 

 extent; secondaries darker brown than wing coverts, crossed by four 

 or five (exposed) broad obsolete bars of a still darker shade, and 

 margined terminally with pale grayish brown; primaries brownish 

 black, slightly grayer on outer webs, where traces of obsolete darker 

 bars can be discovered on second to fourth quills; inner webs of 

 primaries, on under surface, anterior to emarginations, grading from 

 white on first quill to brownish gray on the innermost, all marked with 

 broken bars and freclding of brownish gray; under wing coverts plain 

 dark sooty brown, the greater series rather paler and barred with light 

 grayish, especially on inner webs. Upper tail coverts barred on outer 

 webs with white and dark brown, their inner webs with light grayish 

 brown and dark brown, the lighter and darker bars nearly equal in 

 width. Tail grayish brown, with more or less of a hoary cast (especial- 

 ly on the newer feathers), crossed, beyond tips of upper coverts, by 

 about nine bars of dusky, of which the last is broadest and succeeded 

 by a narrow terminal band of whitish brown (dirty white on newer 

 feathers). Bill grayish black, paler (light bluish in life?) basally; cere 

 yellowish; legs and feet yellowish, claws grayish black. 



Juvenal (and immature) (sexes alike) . — General color of upperparts 



