284 ALOUATTA 



BOLIVIAN HOWLER. 



Type locality. Province of Sara, Bolivia. Type in British 

 Museum. 



Genl. Char. Color of body uniform, limbs only slightly darker; 

 under parts yellowish not orange red as in the Guiana monkey. Black 

 band around face to beneath chin. 



Color. Head very dark maroon, band across forehead down sides 

 of head in front of ears, meeting beneath chin, black; upper parts of 

 body and flanks and arms to elbows pale golden orange, darkest on 

 dorsal line, base of hairs black; forearms and legs, hands, feet and 

 tail above, orange red, paler than sides of head ; hairs on under parts 

 nearly gone but apparently yellowish with a red tinge; the hairs of 

 flanks along abdomen yellowish red not at all like the orange red of 

 the Guiana example ; under side of thigh yellowish red, and tail beneath 

 pale red. Ex type British Museum. 



Measurements. Total length, 1,125; tail, 590; foot, 130; ear, 40, 

 (Collector). Skull: total length, 110.4; occipito-nasal length, 92; inter- 

 temporal width, 43; Hensel, 89.6; zygomatic width, 68.2; length of 

 nasals, 17.4 ; palatal length, 35.5 ; length of upper molar series, 32 ; 

 length of mandible, 81.2; length of lower molar series, 38.2. Ex type 

 British Museum. 



The above described example from Bolivia is a female, and there- 

 fore there can be no comparison between it and that of the one from 

 Guiana which is an old male. The coloring of the upper part of the 

 body in the two animals is not unlike when they are brought under the 

 same light, but beneath, along the flanks, the Bolivian animal has none 

 of the rich orange red characteristic of the eastern species, but is 

 yellowish red on this part. 



Two examples from the Province of Sara are in the British 

 Museum, one of which is young. 



