194 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I50 



Nothing is known of the nesting of this subspecies. Eggs of the 

 closely allied typical form Accipiter s. superciliosus (Linnaeus) 

 from Minas Geraes, Brazil, are described by L. R. Wolfe (Ool, Rec, 

 1936, p. 84) as pale bluish white, with a greenish tinge when viewed 

 against a strong light. One tgg has a wash of light brown over the 

 large end, and scattered streaks and spots of this color elsewhere. The 

 other two in the set appear unmarked until viewed against the light 

 as mentioned, when small specks of reddish scattered through the 

 shell may be seen. They measure 36.1 x29.0, 36.6x29.1, and 39.0 X 

 29.0 mm. Capt. Vivian Hewitt (Ool. Rec, 1937, p. 13), in Venezuela, 

 flushed one of these hawks from a hole in a tree while climbing to a 

 nest of a Busarellus. Both nests were empty but two weeks later he 

 found that the small accipiters had abandoned the hole, and had 

 taken over the nest of the larger hawk. The single &gg that both 

 parents guarded was plain white without markings, and measured 

 35.0x27.5 mm. 



The typical race superciliosus, found from eastern Colombia, east 

 of the Andes, and Venezuela, south through eastern Brazil to Mis- 

 iones in northeastern Argentina, differs only in slightly less heavy bar- 

 ring on the undersurface, with the dark bars grayer, less black. Size is 

 the same in both races. The subspecies found in Panama ranges 

 from Nicaragua south through Central America and Colombia west 

 of the eastern Andes to western Ecuador. 



ACCIPITER STRIATUS VELOX (Wilson): Sharp-shinned Hawk; 

 Gavilancito de Paso 



Falco velox Wilson, Amer. Orn., vol. 5, 1812, p. 116, pi. 45, fig. 1. (Philadelphia, 

 Pennsylvania. ) 



Similar in form to the bicolored hawk, but smaller, darker and 

 with a definite pattern of streaks or bars on the lower surface ; end 

 of tail square. 



Description. — Length 250 to 350 mm. Adult, above slate gray, 

 darker on the crown ; feathers of nape with concealed white bases ; 

 underparts cinnamon-brown, spotted and barred with white ; tail 

 tipped with white, with 4 blackish bands; under tail coverts white; 

 under wing coverts white, spotted and barred with fuscous ; under 

 wing broadly barred with blackish. 



Immature, above fuscous, darker on the head, narrowly edged with 

 tawny ; scapulars and tertials with concealed white spots ; lower sur- 

 face white or pale buff streaked and spotted with fuscous and dull 

 brown. 



