FALCONID2, DIURNAL BIRDS OF PREY.—GEN. 161, 162, 163, 164. 219 
161. Genus ONYCHOTES Ridgway. 
Gruber’s Buzzard. “Nostrils nearly circular, with a *conspicuous (not 
eentral) tubercle; tarsus very long and slender; toes moderate ; claws 
very long, strong and sharp, but only slightly curved; tibial feathers short, 
close, not reaching beyond the joint; wing very short, much rounded, 
and very concave beneath; 4th quill longest, Ist shorter than 9th; tail 
moderate, rounded; outstretched feet reaching beyond tail.” No white 
about head or neck; general color dark bistre-brown, darkest on crown and 
back, below paler and more rusty; primaries uniform black above, below 
showing white basally; tail crossed by 7-8 obscure narrow dark bars ; 
wing 10; tail 5%; tarsus 2%. One specimen known, supposed to come 
from California. Rrpaway, Proc. Phila. Acad. 1870, 149.  . —- GRUBERII. 
162. Genus PANDION Savigny. 
Osprey. Fish Hawk. Plumage lacking aftershafts, compact, imbricated, 
oily, to resist water; that of the legs short and close, not forming the 
flowing tufts seen in most other genera, that of the head lengthened, 
acuminate ; primary coverts stiff and acuminate. Feet immensely large and 
strong, the tarsus entirely naked, granular-reticulate, the toes all of the same 
length, unwebbed at base, very scabrous underneath, the outer versatile ; 
claws very large, rounded underneath. Hook of the bill long; nostrils 
touching edge of the cere. Above, dark brown; most of the head and neck, 
and the under parts, white, latter sometimes with a tawny shade, and streaked 
with brown. 2 feet long; wing 18-20 inches; tail 8-10. Temperate North 
America, abundant; migratory, piscivorous. Wus., v, 13, pl. 87; Nurr., 
i, 18; Aup., i, 64, pl. 15; Cass. in Bp., 44; Coor., 454. . MHALIAETUS. 
163. Genus AQUILA Auctorum. 
Golden Eagle. Tarsus completely feathered. Dark brown with a pur- 
plish gloss; lanceolate feathers of head and neck, golden-brown; quills 
blackish; in the young, tail white, with a broad terminal black zone. 
About 3 feet long; wing upward of 2 feet; tail a foot or more. North 
s gs ul 
America, rather northerly, in winter south ordinarily to about 35°. Wits., 
miewlo, pl. oo, f. 1: Nori, i, 62; Aup., i, 50, pl. 12. A. canadensis 
Paseo. 41) Coop, 449. . . . = « »..» + «+ » CHRYSAETUS. 
164. Genus HALIAETUS Savigny. 
Bald Eagle. Tarsus naked. Dark brown; head and tail white after the 
third year; before this, these parts like the rest of the plumage. About 
the size of the last species. Immature birds average larger than the adults ; 
the famous “Bird of Washington” (Atp., Orn. Biog., i, 58, pl. 11, and B. 
Amer., i, pl. 13, Kentucky) isa case in point. North America, common ; 
piscivorous; a piratical parasite of the osprey; otherwise notorious as the 
emblem of the Republic. Wius., iv, 89, pl. 36; vii, pl. 55; Nurr., i, 72; 
Awp., i, 57, pl. 14; Cass. in Bp., 43; Coor., 451. . . LEUCOCEPHALUS. 
