512 Mr. O. Thomas on Agoutis. 
Dasyprocta variegata bolivie, subsp. n. 
Most nearly allied to D. v. yungarum, but conspicuously 
lighter in colour. General colour of fore-back, when seen 
from a distance, near “ buckthorn-brown” of Ridgway, the 
hairs ringed with black and ochraceous. Long hairs of rump 
black, with narrow ochraceous tips, which soon wear off, 
leaving the hairs wholly black. Middle line of under surface 
vivid ochraceous, not so sharply defined laterally as in 
yungarum. Upper surface of hands and feet like body, 
grizzled ochraceous and black, not wholly black as in other 
members of the vartegata group. 
Dimensions of the type :— 
Hind foot 104 mm. 
Skull: zygomatic breadth 53; nasals 41:3; palatilar 
length 43 ; upper tooth-series 19:5. 
Hab. Southern Bolivia. Type from Yacuiba, on the Argen- 
tine boundary south of Caiza. Other specimens from Santa 
Cruz de la Sierra and its neighbourhood. 
Type. Old female. B.M. no. 7. 8. 2.22. Original num- 
ber 26. Collected 15th August, 1905, by J. Steinbach. 
Presented by Oldfield Thomas. 
The agoutis from Southern Bolivia are readily distinguish- 
able by their generally light colour and their grizzled ochra- 
ceous feet, all those from Peru and north-westwards having 
black feet. 
Among the specimens I refer to this form are some at least 
of those from Santa Cruz de la Sierra, collected by Bridges 
and determined by Waterhouse as D. azarae. One of them 
is quite like the Yacuiba specimen, while another has less 
black hairs on the rump. But owing to the histories and 
individual localities of Bridges’s specimens not having been 
preserved, it is difficult to know quite what this variation 
means, 
One specimen also from Charuplaya, Bolivia, collected by 
P. O. Simons, has the general colour and light feet of this 
form, while another from the same place is closely similar to 
true yungarum, so that that would appear to be about the 
region where the two forms pass into one another. 
Allen’s D. v. urucuma* from Corumba, Matto Grosso, 
further to the east, appears to be darker and has the “ hind 
feet deep black ” as in ordinary D. variegata. 
* Bull. Am. Mus. xxxiy. p. 634 (1915). 
