334 TALCOyjDM. 



Buteo cayennensis, Less. Man. d'Orn. i. p. 103 (1828). 

 Cvmindis buteonides, Less. Traite, p. 55 (1831). 

 Odontriorchis cayennensis, Kmip, Classif. Siiug. u. Vog. p. 124 (1844); 

 Cab. in Schomb. Heis. Guian. iii. p. 736 (1848). 



Young. Above brown, all the feathers margined with pale rufous 

 brown, the sides of the face and neck much paler and slightly in- 

 clining to rufous, the nape mixed with white ; quills brown, banded 

 ■with black, the bars on the secondaries narrower and nearly obso- 

 lete, these latter tipped with pale rufous ; under surface of wing 

 greyish, barred with brown ; upper tail-coverts dark brown, banded 

 with pale rufous, the lateral ones white at the base, and banded 

 also with white ; tail pale brown, tipped with whity brown, crossed 

 by four black bars, one basal and very narrow ; under surface of 

 body white, streaked with long shaft-stripes of dark brown, larger 

 on the sides of the breast, and forming a broad mesial streak down 

 the throat, as well as a clearly defined moustachial streak along the 

 lower cheek-Une ; under wing-coverts white, shghtly washed with 

 rufous, especially on the outer margin. 



Intermediate stage. This is very different from the young plumage, 

 and seems to be attained by a partial, if not complete, moult. 



Upper surface dark brown, a few of the wing-coverts and the inner 

 secondaries margined with pale buff or rufous, the latter more 

 broadly ; entire head and neck all round as well as the whole of the 

 underparts pure white (in the specimen described a few brown 

 feathers remaining on the crown and behind the eye) ; quills and 

 tail-feathers as in the youug. 



From this stage the fully adult dress is gained by a partial moult ; 

 but the grey shade on the head and neck appears to be the result of 

 a change in the feather itself. 



Adult female. Above glossy black, with a very slight greenish 

 shade in some lights ; quills slaty grey, conspicuously banded with 

 black, the under surface of wing paler, white at base, ashy towards 

 the apical half, broadly banded with black ; upper taU-coverts black, 

 barred with ashy grey ; tail black, with three bands of ashy grey, 

 and narrowly tipped with the same ; head slaty grey, a little lighter 

 on the sides of the face ; entire imder surface white ; under wing- 

 coverts black, the lower ones ashy grey, those on the lower part of 

 the bend of the wing white ; bill hom-black ; feet yeUow, claws 

 hom-browu. Total length 24-5 inches, culmen l-o, wing 14-5, tail 

 10-5, tarsus 1-8. 



Adidt male. Similar to the female, but smaller. Total length 

 18 inches, culmen 1-5, wing 13, tail 9, tarsus 1-6. 



Hab. Central America ; Guiana ; Amazonia ; Brazil. 



a. 2 ad. st. South America. Purchased. 



b. (S ad. st. South America. Purchased. 



c. d. Juv. St. South America. Purchased. 



e. Ad. sk. Para. R. Graham, Esq. [P.]. 



/. Juv. st. Caracas. Mr. Dyson [C.j. 



g. Juv. sk. Demerara. R. B. Sharpe, Esq. [P.]. 



h. Juv. st. West Indies [?]. 



i. Juv. sk. Honduras. G. Whitely, Esq. [C.]. 



