new Species of Monkeys. 79 



Gen. char. Size large; head tufted, tooth-rows straight, 

 teeth large. 



Colour. Face flesh-colour about eyes and forehead ; lips 

 apparently brownish ; superciliary band extending backwards 

 to temples yellowish white ; hairs on upper lip at corners of 

 mouth and on chin whitish ; head with tufts, band in front 

 of ears, body above and beneath, limbs and tail jet-black; 

 hands and feet brownish black ; hairs on fingers and toes 

 brownish grey. 



Measurements. Total length 1095 mm. ; tail 560 ; foot 135; 

 Skull: total length 99*3 ; occipito-nasal length 89'2 ; inter- 

 temporal width 40; width of brain-case 53"5 ; hensel 70"4 ; 

 zygomatic width 73 - 2 ; length of nasals 18'2 ; palatal length 

 335 ; length of upper molar series 24'8 ; length of mandible 

 70 ; length of lower molar series 2S"5. 



Type. Adult, in British Museum, no. 3. 9. 1. 15. 



This is a very large Cebus, and was received from the 

 Museum in Sao Paulo, Brazil, under the name of C. robustus. 

 The skull is large, with the molar series straight, and the 

 teeth larger than those of C.fatuellus. This example came 

 under my notice last spring, and I was then satisfied it must 

 represent a new species, but did not include it in my paper 

 with other undescribed species, preferring to wait and see if 

 perhaps 1 could find another example in the continental 

 museums. In this search 1 failed, no specimen resembling 

 this one in any way having been seen. It is the only 

 black Cebus I have met with, and its large size, prominent 

 tufts, and coal-black dress make it a very conspicuous object. 

 It is, of course, needless to add that it bears no resemblance 

 whatever to C. robustus. 



Subfamily Alouattinje. 



Genus Alouatta. 

 Alouatta insulanus, sp. n. 



Type locality. Island of Trinidad. 



Gen. char. Size small ; colour nearly uniform throughout; 

 limbs only slightly darker than the, body. 



Colour. Head and whiskers maroon, darkest on chin and 

 throat; upper part of body and flanks red, in certain lights 

 with a golden hue; limbs, hands, and feet bright red, with a 

 maroon tinge on forearms ; tail at root bright maroon, grading 

 into golden and growing paler at tip. 



Measurements. Total length 1 120 mm. ; tail 600 ; foot 105. 

 No skull. 



