448 Annals of the Carnegie Museum. 



g. Lower parts (at least abdomen) more or less heavily 

 barred. 

 h. Upper parts mainly sooty-black. 

 i. Size large (wing 280 to 300). 



j. Entire lower parts coarsely barred with 

 dark chestnut-brown and white (or 

 buffy). Leptodon uncinatus, juv. 



jj. Forehead and lores mixed with white ; 

 lower parts blackish, barred with buff- 

 white. Leptodon uncinatus, adult. 

 ii. Size small (wing not more than 145) ; en- 

 tire lower parts finely barred with sooty- 

 black and white (rufous and white in 

 young ) . Accipiter tinus . 

 hh. Upper parts sooty-gray or grayish-brown ; con- 

 cealed portion of remiges largely chest- 

 nut-rufous. 

 i. Chest dirty buff-gray, unmarked ; upper parts 

 unmarked ; belly barred with rufous and 

 buff. Rupornis ruficauda, adult. 

 ii. Entire lower parts buff-ochraceous, chest 

 heavily streaked with dusky rufous ; breast 

 and abdomen brokenly barred with rufous. 

 Rupornis ruficauda, juv. 

 gg. Lower parts streaked or mottled but not barred. 



h. Size larger (wing 290) ; blackish above, con- 

 cealed white on nape ; chest and throat black, 

 broadly streaked with sooty-gray ; abdomen 

 whitish, heavily streaked and mottled with 

 sooty- black ; tail gray with two black bars. 



Leptodon cayennensis, juv. 

 hh. Smaller (wing 210) ; dark slate-color (adults) or 

 sooty-brown (juv.) above; lower parts buff- 

 ochraceous, more or less heavily streaked with 

 dark brown (less in adult) ; under wing-coverts 

 mottled with white and dark brown. 



Falco columbarius. 

 bb. Tail always less than two-thirds the length of the wing. 

 c. Tail never less than one-half the length of the wing. 



d. Under parts more or less extensively barred, not streaked (except 

 sometimes on throat). 

 e. Throat and upper chest buff-ochraceous, white or slaty-black, 

 unmarked. 

 f. Throat buffy or white, unmarked. 



g. Breast black, narrowly barred with white ; belly and 

 thighs chestnut (wing 190). Falco rufigularis . 



