13 



Wing ^ 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. 



t22. Polyborus lutosus Ridgw., Bull. U.S. Geol. Guadeloupe 

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

 Guadeloupe Caracara. (now extinct). 



Wing <S 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 recurved crest. 

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



23. Ihycter 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. 



