30 PYGATHRIX 



KEY TO THE SPECIES AND SUBSPECIES. 



A. Head crested. 



a. General color ochraceous or reddish. 

 a.' Occipital crest black or blackish. 



a." Limbs ochraceous P. melanolopha. 



b." Limbs bright fox red P. nobilis. 



b.' Occipital crest chocolate red P. rubicunda. 



c' Occipital crest tawny P. carimata. 



b. General color brown, or slaty gray. 



a.' Upper parts Prout's brown P. frontata. 



b.' Upper parts slaty gray P. nudifrons. 



c. General color above black or brownish black ; no 



white on head. 



a.' Crest ochraceous rufous P. cruciger. 



b.' Crest black. 



a." Upper parts of body black; tail white 



beneath P. chrysomelas. 



b." Upper parts of body brownish black; 

 tail white at base only. 

 a.'" Size large ; mandible broad, rather 



heavy P. sumatrana. 



b.'" Size small ; mandible light and 



slender P. batuana. 



c! Crest brown. 



a" Tail all black P. percura. 



b." Tail white at base beneath P. femoralis. 



d. General color reddish brown or dusky. 



a.' Limbs and tail blackish brown P. melamera. 



b.' Limbs and tail grayish P. barbei. 



e. General color dusky gray P. holotephrea. 



f. General color broccoli brown P. pliayrei. 



g. General color black tinged with brown, tail cream 



color P. flavicauda. 



h. General color creamy white with black hairs 



mixed P. robinsoni. 



i. General color dark, or pale brown. 

 a.' Thighs grayish, not white. 



a." Nuchal patch conspicuous. 



a.'" Upper parts sooty black P. obscura. 



b.'" Upper parts black. 



