ASTURINA. 239 
a’, Tarsus 3.50 or less ; upper tail-coverts in adult black barred or tipped with white. 
Adult: Uniform black, with a chalky or glaucous cast in certain lights; 
upper tail-coverts narrowly tipped with white; tail black, the tip and 
base white, and crossed at about the middle by a broad band of white of 
variable width. Young: Above brownish black, varied by ochraceous or 
rusty edgings and spots; head, neck, and lower parts pale ochraceous, 
striped with brownish black; thighs barred with the same; tail crossed 
by about seven narrow oblique bands of black and whitish, of variable 
relative width. Downy young : “ Covered with dense woolly down, nearly 
white on head and breast, passing into grayish posteriorly upon the head, 
throat, sides of breast, tibiee, and back.’ (Mxarns.) Male: Length 
about 21.50, wing 13.15-14.90, tail 7.90-9.75, culmen 1.00-1.05, tarsus 
3.20-3.40, middle toe 1.60-1.70. Female: Length 20.00-22.50, wing 
14.25-16.00, tail 9.25-11.00, culmen 1.05-1.10, tarsus 3.00-3.50, middle 
toe 1.65-1.80. Westin large trees. Eggs 2-3, 2.32 x 1.88, plain white. 
Hab. Tropical America in general, north to southern Arizona. 
345. U. anthracina (Licut.). Mexican Black Hawk. 
Genus ASTURINA Viertior. (Page 223, pl. LXVIIL., fig. 1.) 
Species. 
a’. Adult with upper parts very indistinctly barred, or almost uniform. Young, 
with thighs distinctly barred with dusky, and lighter tail-bands grayish 
brown. 
Adult: Above deep ash-gray, the top of head and hind-neck with fine 
blackish shaft-streaks, the wing-coverts with indistinct paler bars; upper 
tail-coverts plain white; tail black, tipped with grayish or white, and 
crossed by two to three narrow bands of white, the anterior one nar- 
rower and more or less interrupted ; quills black, margined at tips with 
whitish; lower parts white, everywhere, except on lower tail-coverts, 
very regularly barred ‘with deep cinereous, these bars narrower, and the 
white interspaces correspondingly wider, on flanks and abdomen. Young: 
Above dark brown, the head and neck streaked, the middle wing-coverts 
and greater portion of outer webs of scapulars irregularly spotted, with 
ochraceous or buffy (usually of a pinkish cast); upper-tail-coverts white, 
marked near tips with one or two small spots of dusky; tail grayish 
brown, tipped with paler (the extreme tip usually whitish), and crossed 
by.six or seven narrow bands of black, these becoming gradually, but 
decidedly, smaller toward the base; lower parts white, more or less 
tinged (especially on sides and under wing-coverts) with pinkish buff, 
the breast, belly, and sides with large tear-shaped or wedge-shaped 
stripes or longitudinal spots of blackish, the thighs narrowly barred 
with the same. Length about 16.00-18.00, wing 9.50~-11.70, tail 6.70- 
8.20, culmen .75-1.00, tarsus 2.50-2.85, middle toe 1.35-1.75. Nest in 
trees. Eggs 2-3, 2.00 x 1.61, white, usually very faintly and sparsely 
