272 On new Forms of Nasua and Dasyprocta. 
it does not exceed these latter in length. It is stout and 
strongly built, the zygomata heavy and widely expanded, the 
ridges well developed, the muzzle not pinched in above, the 
posterior palate broad, parallel-sided, and little ridged on its 
buccal aspect, and the bullee smaller and less globular than in 
NN. narica. Teeth shaped as in N. narica, but markedly 
smaller throughout, about equal in size to those of N. montana. 
Dimensions of the type (an old male, measured on the re- 
made skin) :— 
Total length 910 millim.; head and body 530; tail 380 ; 
hind foot, s. u. 77, c. u. £9; ear 28. 
Skull: greatest length, from convexity above foramen 
magnum, 109; basal length (c.) 101; zygomatic breadth 64; 
interorbital breadth 24; breadth of brain-case 41; palate 
length from gnathion 67; breadth across outside m* 30; 
combined length of last three teeth above 18, ditto below 20. 
Hab. Cozumel Island, off the coast of Yucatan. 
Type. Old male. B.M. no. 86. 10.8. L. Collected Jan- 
uary 1886 by G. F. Gaumer, and presented by Messrs. F’. D. 
Godman and O. Salvin. <A young female also in the collec- 
tion. 
This animal has no relationship to the small South- 
American species N. montana, quichua, and olivacea, but is 
an insular representative of NV. narica, from which it differs 
by its rather darker colour and much smaller size. 
Dasyprocta ruatanica, sp. n. 
Closely allied to D. punctata, but much smaller. 
Size markedly less than in D. punctata. Fur, as in that 
species, everywhere annulated to the roots with black and 
ochraceous or yellow, the annulations conspicuous on the 
surface, though rather less so on the rump. On the whole, 
the fore back is more ochraceous and the hind back more 
yellow, but the difference is not conspicuous. Under surface 
like back, but more olivaceous, and there is a white spot on 
the chin and a yellow patch on the middle of the lower part 
of the belly. Crown like fore-back. Ears nearly naked, 
their few hairs blackish. Limbs like body proximally, dark- 
ening terminally on hands and feet to grizzled or deep brown. 
The youngest specimen has the darkest feet, but this is 
probably accidental. 
Skull in general shape closely agreeing with that of the 
type of D. punctata, but conspicuously smaller in all dimen- 
sions. 
