13 



Wing 3 400, $418 mm. ; above black, 

 mantle only with creamy buff wavy bars ; 

 upper tail coverts white ; tail buff with 

 13 or 14 black bars and a broad terminal 

 band. 



21a. Polyborus cheriway pallidus Nelson, Pr. Tres Marias 



Biol. Soc, Wash., xii., p. 8 (1898). [Tres Is., W. Mexico. 



Marias Is.] 



Tres Marias Caracara. 



Paler insular race. 



f22. Polyborus lutosus Ridgw., Bull. U.S. Geol. Guadeloupe 

 Surv. Terr., i., p. 459 (1875). [Guadaloupe.] I., W. Mexico 

 Guadeloupe Caracara. (now extinct). 



Wing <J 380-400, ? 393-416 mm. ; general 

 plumage marked with transverse bars of 

 brownish black and brownish white ; crown, 

 wing-coverts, terminal portion of primaries 

 and terminal band on tail blackish brown. 



Gen. XV. IBYCTER Vieill. (1816) 

 Type Falco americanus Bodd. 



Head generally with recur yed crest. 

 Nostrils round. Size variable (16-25 in.). 



23. Ibyder ater (Vieill.), Analyse, p. 22 (1816). Amazon 

 [Brazil.'] District of 



Yellow-throated Caracara. S. America. 



Wing ad. 322 mm. ; plumage black with 

 greenish reflections ; a white band across 

 base of tail. 



