242 ALLEN'S NATURALIST'S LIBRARY. 



VII. THE GRIZZLED SPIDER MONKEY. ATELES GRISESCENS 

 Ateles grisescens, Scl. MSS. ; Gray, P. Z. S., 1865, p. 732 ; id. 

 Cat. Monkeys Brit. Mus., p. 42 (1870) ; Scl., P. Z. S., 

 1871, p. 223 ; Schl., Mus. Pays Bas, vii., p. 168 (1876). 



Characters.; Hair of forehead elongate. Fur in general 

 moderately long, black, with greyish-white hairs intermingled, 

 giving it a grizzled appearance ; under side of tail grey. 

 Similar to A. ater and A. paniscus, but distinguished by the 

 intermixture of grey hairs, and by the colour of the under side 

 of the tail. Thumbs absent. 



Young Male. Rather lighter in colour, especially on the 

 under side of body ; tail black above, grey beneath. Length 

 of body, 14 inches; tail, 16 inches. 



Distribution. The habitat of this species is not certainly 

 known. Dr. Sclater considers it probable that it will turn up 

 in some part of the Central American or the Colombian 

 coast. 



VIII THE BROWN-HEADED SPIDER-MONKEY. ATELES FUSCICEPS. 



Ateles fusciceps, Fraser MSS.; Gray, P. Z. S , 1865, p. 733; 

 Sclater, P. Z. S., 1872, p. 663, pi. Iv. ; Gray, Cat. Monkeys 

 Brit. Mus., p. 42 (1870); Schl., Mus Pays Bas, vii., 

 p. 173 (1876). 



Characters. Fur thick. Hairs long, shining, crisp, deep 

 black above, the hairs of the back with brownish tips ; the 

 under side of the body and inside of the limbs black ; crown 

 of head deep coffee-brown. Length of body about 20 inches ; 

 of the tail, 26 inches, according to the dimensions taken from 

 the skin of a young animal by Dr. Sclater. Thumbs entirely 

 wanting 



