95 
Gen. XXXVII. BUSARELLUS Lafr. 
(1842). 
Type by orig. desig. “‘ Le Buserai’”’ Levaill. 
[= Falco mgncollis Lath.] 
Size of Buteo ; sole of foot covered with rugose and 
thorny spicules (like that of Pandion) tip of upper 
mandible much curved. 
160. 
Busarellus nigricollis mgricollis (Lath.), 
Ind. Orn. 1, p. 35 (1790). [Cayenne.] 
» Black-collared Hawk. 
160a. 
160b. 
Wing 3 360-380, 2 385-398 mm.; above 
bright chestnut, with narrow black shaft 
stripes ; outermost wing-coverts and quills 
black ; basal half of tail chestnut banded 
with black, apical half black with narrow 
white tip; head and neck creamy buff, 
head washed with rufous and striped with 
black ; lower throat black; below chest- 
nut. 
Busarellus nigricollis macropus subsp. nov. 
[$ Tally Pan, Manatee R., Br. Honduras, 
G. B. Thomas, May 12, 1906, type in M.C.Z. 
Harvard. | 
Northern Black-collared Hawk. 
Larger ; wing g 410, 2 410-420 mm. ; tarsi 
and feet much stouter and larger; paler 
above and below; head and neck whiter. 
Busarellus mgricollis australis subsp. nov. 
[3 Morow, Arg., Sept. 3rd, 1915, S. Ven- 
turi Coll., No. 1015, type in Tring Mus.] 
Argentine Black-collared Hawk. 
Larger; wing ¢ 415, 2 428 mm.; paler 
generally ; head and neck whiter. | 
Guiana, Brazil, 
Peru, Venezuela, 
Central America 
(Panama to 
Nicaragua), and 
W. coast 
Mexico to 
Mazatlan. 
Guatemala and 
Brit. Honduras. 
N. Argentina 
Paraguay. 
