99 
black; tail black with median white 
band (25-30 mm.) and white tips; in 
younger birds a second white band nearer 
base. 
Gen. XL. LEUCOPTERNIS Kaup (1847). 
Type by subs. desig. (Gray 1855) Falco melanops Lath. 
Similar in structure to Urubitinga ; nostril nearly 
circular ; tarsus not more than twice as long 
as middle toe ; plumage usually more white than 
black. 
165. 
*165a. 
166. 
Leucopternis schistacea schistacea (Sundev.) 
(fv. K. Vet. Akad. Férh. 1850, p. 142 
(1851). [Brazil.] 
Slate-coloured Hawk. 
Wing ¢ 240, 2303 mm. ; plumage uniform 
slate colour; tail black, with a white 
median band and white tip. 
Leucopternis schistacea plumbea Salv., Ibis., 
1872, p. 240, pl. viii. [Ecuador.} 
Plumbeous Hawk. 
Wing g 248-255 mm. ; uniform leaden grey; 
wings and tail black, latter with a median 
bar of ashy-white; under wing-coverts 
white and tibial plumes more or less barred 
with same. 
Leucopternis albicollis albicollis (Lath.) Ind. 
Orn. 1, p. 36 (1790). | [Cayenne.] 
White-collared Hawk. 
Wing 3$ 320-337, 2 365 mm.; general 
plumage white ; head streaked with black, 
interscapulary region spotted with black; 
scapulars and wing-coverts black spotted 
Ba Pent, C. and 
N.E. Brazil, 
Columbia ? 
Ecuador, 
W. Colombia, 
Panama. 
French, Dutch. 
and British 
Guiana, 
Trinidad, 
Venezuela and 
Amazonia to 
Ecuador and 
Peru. 
