444 



Annals of the Carnegie Museum. 



f. Larger (wing, 860 ; tail, 200 mm.) ; most of primaries 



white on inner web towards base and thickly barred 



with sooty (immature birds with white spots on breast). 



Buteo abbreviates, adult $ and 9 • 



ff. Smaller (wing, 280; tail, 160 mm.) ; inner webs of most 



of primaries white basally, without bars (black phase). 



Buteo brachyurus, adult $ and 9 • 



ee. Tail with not more than four white bars and a white tip. 



f. Lower parts black or sooty (not plumbeous). 



g. Larger (wing, 380; tail 230 mm.) ; tail with four 

 narrow white bars, basal ones narrower ; base of 

 tail black, upper tail-coverts tipped with white. 



Urubitinga anthracina, adult $ and 9 • 

 gg. Smaller (wing, 300 ; tail, 220) ; one bar and a large 

 basal area of white ; upper tail-coverts entirely 

 black. 

 h. Tail longer (240 mm.) ; maxillary hook project- 

 ing below mandible not more than 5 mm. 



Geranospizias niger, adult $ and 9 • 

 hh. Tail shorter (220 mm.) ; maxillary hook at 

 least 1 1 mm. long. 



Leptodon uncinates , adult $ and 9 • 



ff. Lower parts plumbeous (wing about 290 ; tail 140 mm.). 



g. Inner webs of primaries largely chestnut ; head and 



under parts ashy-plumbeous ; tail black, with three 



white bars. Ictinia phimbea. 



gg. No chestnut on primaries ; tail gray, with a broad 



terminal band of black. 



Rostrkamus sociabi/is, adult $ and 9 • 

 cc. Under parts pure white. 



d. Upper parts mainly white or else whole head and nape white 

 (sometimes a few black feathers on occiput). 

 e. Entirely white, except apical portion of quills and a sub- 

 terminal bar on tail, black. Leucopternis ghiesbreghti. 

 ee. Only head and nape wh te, rest above dark. 



f. Tail long and forked ; no black feathers on occiput ; inner 



secondaries largely white. E/anoides furcates. 



ff. Tail square ; occiput black, shoulders white ; tail and 



inner surface of primaries grayish- white, both barred 



with blackish (wing, 420). Spiziastur melanoleucus. 



dd. No white on upper parts (crown mixed with white in Pandion). 



e. Size large (wing 490) ; soles of feet strongly rugose ; claws 



long and curving (longest 30 mm.). 



Pandion haiiaetes, <£ and 9 • 

 ee. Size smaller (wing 200 to 280 mm.) ; feet not strongly rugose. 

 f. Entire upper parts plumbeous or slaty-black. 



