Size of 
95 
Gen. XXXVII. BUSARELLUS Lafr. 
(1842) 
Type by orig. desig. ‘‘ Le Buserar”’ Levaill 
[= Falco mgricollis Lath.] 
Buteo ; sole of foot covered with rugose and 
thorny spicules (like that of Pandion) tip of upper 
mandible much curved. 
160. 
160a. 
160b. 
Busarellus mnigricollis nigricollis (Lath.), 
Ind. Orn. 1, p. 35 (1790). [Cayenne.] 
Black-collared Hawk. 
Wing ¢ 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 bufl, 
head washed with rufous and striped with 
black ; lower throat black ; below chest- 
nut. 
Busarellus ngricollis macropus subsp. nov. 
[d 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, 9 410-420 mm. ; tarsi 
and feet much stouter and larger ; paler 
above and below; head and neck whiter. 
Busarellus nigricollis australis subsp. nov. 
[$ Morovi, 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. 
