95 



Gen. XXXVII. BUSARELLUS Lafr. (1842) 



Type by orig. desig. " Le Buserai " Levaill 



[ = Falco nigricollis 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 nigricollis (Lath.), 

 Ind. Orn. 1, p. 35 (1790). [Cayenne.] 

 Black-collared Hawk. 



Wing ^ 360-380, $ 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. 



Guiana, Brazil, 

 Peru, Venezuela, 

 Central America 

 (Panama to 

 Nicaragua), and 

 W. coast 

 Mexico to 

 Mazatlan. 



160a. Busarellus nigricollis macropus subsp. nov. 

 [cJ Tally Pan, Manatee R., Br. Honduras, 

 G. B. Thomas, May 12, 1906, type in M.C.Z. 

 Harvard.] 

 Northern Black-collared Hawk. 



Larger ; wing ^ 410, ? 410-420 mm. ; tarsi 

 and feet much stouter and larger ; paler 

 above and below ; head and neck whiter. 



Guatemala and 

 Brit. Honduras. 



160b. Busarellus nigricollis australis subsp. nov. N. Argentina^ 

 [(^ Morovi, Arg., Sept. 3rd, 1915, S. Ven- Paraguay, 

 turi Coll., No. 1015, type in Tring Mus.] 

 Argentine Black-collared Hawk. 



Larger ; wing cJ 415, ? 428 mm. ; paler 

 generally ; head and neck whiter. 



