new Mammals from South America. 273 



As no other pertinent names have been given, for the red 

 hips and white incisors will readily distinguish the Amazonian 

 D, croconofa, Wagl., the red-rumped Aguti inhabiting 

 Trinidad and Guiana will need a new name, and may be 

 called 



Dasyprocta ruhrata, sp. n. 



Fur of fore back and sides broadly ringed with black and 

 dark yellow, the general effect being decidedly darker than in 

 D. aguti. On the posterior back, as the hairs lengthen, the 

 black rings tend to die out and the yellow gradually becomes 

 more reddish, that of the ends of the long rump-liairs deep 

 chestnut-red ; but beneath the surface the bases of these hairs 

 are more orange — in fact, they are orange at their base, 

 reddening outwards to the small subterminal black ring, and 

 with their tips chestnut. Nape and upper surfaces of hands 

 and feet black. Under surface dirty grizzled brownish, not 

 lighter than, and quite continuous with, the colour of the 

 flanks ; the interramia, a few hairs on the middle line of the 

 belly, and the inguinal region are inconspicuously yellowish 

 or white. 



Skull with the nasals short, evenly rounded behind. Ridge 

 running forward above from the upperside of the infraorbital 

 foramina continuous with the line of the incisors, instead of 

 being nearer the nasals as in D. aguti. Bulla smaller. 



Dimensions of the type (a nearly adult female, measured 

 in the flesh by the collector) : — 



Head and body 499 millira. ; tail 28 ; hind foot, without 

 claws 98, with claws 108 ; ear 40. 



Skull : greatest length 100 ; basilar length 72*5 ; greatest 

 breadth 46*5; nasals 36*5x17; interorbital breadth 28; 

 palate length from henselion 37"5 ; diastema 25 ; length of 

 upper tooth series 17*5. 



Hah. (of the type). Savannah Grande, Trinidad, 



Type B.M. no. 97. 6. 7. 17. ? . Collected Feb. 11, 1897, 

 by l3r. Percy Kendall. 



Another example from Trinidad, presented by Mr. H. 

 Caracciolo, is in the Museum collection, while three specimens 

 of different ages are labelled as coming from Surinam and 

 Cayenne. 



The black nape, black feet, darker body-colour, and darker 

 belly will readily separate this animal from the Brazilian 

 D. aguti. 



