312 Ml'. 0. Thomas on Agoutis. 



Dasyprocta variegata holivice, subsp. n. 



Most nearly allied to D. v. yimgariim, but conspicuously 

 lighter in colour, Greneral colour of fore-baclc, when seen 

 from a distance, near '' bucktliorn-brown " of llidgway, ihe 

 hairs ringed with lilack 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 variegata group. 



Dimensions of the type : — 



Hind foot 104 mm. 



Skull: zygomatic breadth 53; nasals 41*3; palatilar 

 length 43 ; U})per tooth-series 19*5. 



IJah. 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 2&. 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 AVaterhouse as D. azarce. One of them 

 is quite like the Tacuiba specimen, while another has less 

 black hairs on the rump. But owing to the histories and 

 individual localities of Bridges's s})ecimens not having been 

 preserved, it is difficult to know quite what this variation 

 means. 



One specimen also from Charuplaya, Bolivia, collected by 

 P. 0. Simons, has the general colour and light feet of this 

 form, while another from the same place is closely similar to 

 true yiingarwn^ so that that would appear to be about the 

 region where tlie two forms pass into one another. 



Allen's D. v. urucuma* from Corumba, Matto Grosso, 

 farther to the east, appears to be darker and has the " hind 

 feet deep black " as in ordinary D. variegata. 



* Bull. Am. Mas. xxxiv. p. 634 (1915). 



