218 FALCONIDA, DIURNAL BIRDS OF PREY.—GEN. 160. 
Oss. I cannot admit Buteo oxypterus (Cass., Proc. Phila. Acad. 1855, 282, and 
in Bp., 30; Fort Fillmore, N. M.) as a valid species, although Iam not prepared 
to assign it as a synonym of any one of the foregoing. The type and only recog- 
nized specimen is apparently a young bird, very near swainsonii, if not the same. 
(Compare B. fuliginosus Scu., Proc. Zool. Soc. 1858, p. 356.) 
160. Genus ARCHIBUTEO Brehm. 
* .* Large hawks with the tarsi feathered in front to the toes; upward of 2 feet 
long; wing 16-18; tail 8-10. Four outer primaries emarginate on inner web. 
tough-legged Buzzard. Below, white, variously dark-marked, and often 
with a-broad black abdominal zone; but generally no ferrugineous. North 
America; abundant. The black hawk, A. sancti-johannis, is a melanotic 
state, in which the whole plumage is nearly uniform blackish. This does 
not appear to have been observed in the European bird, of which ours is a 
variety. The name adopted, it must be observed, is not intended to 
discriminate this black plumage, but to distinguish the American bird from 
the European lagopus, as a geographical race. Falco lagopus Wixs., iv, 59, 
pl. 33, f. 1; v, 216, pl. 53, f. 1, 2; #. niger Wixs., vi, 82; Buteo lagopus 
Sw. and Riow., F. B.-A. ii, 52, pl. 28; Nurr., i, 97, 98; Aup., i, 46, pl. 
11. Cass. in Bp., 32, 33; Coop., 483. . LAGOPUS var. SANCTI-JOHANNIS. 
Ferrugineous Buzzard. Below, pure white, scarcely or not marked, 
excepting that the legs are rich rufous with black bars, in marked contrast ; 
above, varied with dark brown, rufous, and white; quills brown, with much 
white ; tail silvery-ash, clouded with brown or rufous. Young duller above, 
more marked below, tibize not so strongly contrasted in color. Our hand- 
somest and one of our largest hawks, inhabiting Western U. S., especially 
California, Arizona and New Mexico. Cass., Ill. 159, pl. 26, and in Bp., 
34; Cours, Proc. Phila. Acad. 1866, 46; Coopr., 482. . FERRUGINEUS. 
160bis. Genus ASTURINA Vieillot. 
Gray Hawk. Nostrils horizontal, without tubercle, upper outline straight, 
lower semicircular; 4 outer primaries emarginate on inner web. Adult 
above cinereous, darkening on the rump; below closely barred with cinere- 
ous and white; tail blackish, with about three white bars, its upper and 
under coverts white; quills ashy-brown, with darker bars and much white 
edging on inner webs; crown with a lateral white stripe; cere and feet 
yellow; 9? 18; wing 10; tail 74; g less. Young above umber-brown, 
below white with longitudinal brown stripes ; tail light brown with numerous 
dark bands; tibize barred. A handsome species, resembling a goshawk, but 
belonging to the buteonine group; admitted to our fauna in 1858 (A. nitida 
Cass. in Bp., 35; Coop., 486) upon the strength of its occurrence in 
Northern Mexico, but only lately detected in the United States. Illinois, 
Rineway, Am. Nat. 1872, 430. 5. Avizona, breeding (Lendire, in epist.). 
A. plagiata Souu., Mus. P.-B. Asturine, 1; Sou. and Sary., Proce. Zool. 
Soc. 11869, 130. | (Not inithe Key.) )2 2) .) en ee eae ee RGAE 
a 
