new Rhipidomys de. from S.E. Jujuy. 185 
in A.arenicolahunteri. Palatal foramina long, reaching past 
the second lamina of m'’. 
Molars inclined to be hypsodont. A median notch on the 
front edge of ml. 
Dimensions of the type :— 
Head and body 102 mm.; tail 77; hind foot 21:5; 
ear 16. 
Skull: greatest length 27; condylo-incisive length 25 ; 
zygomatic breadth 13:7; nasals 10°33; interorbital breadth 
4°4 ; breadth of brain-case 12; palatilar length 11°7 ; palatal 
foramen 6°9; upper molar series 474. 
Hab. Sierra de Santa Barbara, 8.E. Jujuy. Type from 
Sunchal, 1200 m. 
Type. Adult male. B.M. no. 21.1.1.27. Original 
number 1019. Collected 5th June, 1920, by E. Budin. 
Fifteen specimens. 
Considering its wide geographical separation, this Santa 
Barbara Akodon has a curious resemblance to the A. arenicola 
hunteri of the Parana Delta, with which it agrees closely in 
_ size and colour. Its skull may, however, be distinguished 
by the greater breadth both of the interorbital space and of the 
brain-case. 
“Caught in thick damp woods at from 1200 to 2000 
metres.8—H, B. 
Ctenomys budini barbarus, subsp, n. 
Santa Barbara race of budini. Middle line of muzzle 
blackened. 
General appearance very much as in C. budini utibilis, 
but the median line of the muzzle, for a breadth of about a 
centimetre, is always prominently black, the black often 
running back to the forehead. The sides of the muzzle, 
external to the black, have a warm, almost reddish, tone, 
generally much warmer than that of the body. Back near 
* auburn”; belly pale buffy brown. Axillary and inguinal 
patches only rarely present. Upper surface of hands and 
feet largely mixed with black. Tail black or blackish 
mixed, well haired. 
Skull as in the other subspecies. Supplementary bones at 
the front end of the parietals generally present. 
Dimensions of the type: — 
Head and body 217 mm.; tail 80; hind foot 32. 
Skull: median length 48°5 ; condylo-ineisive length 48°5 ; 
zygomatic breadth 31; nasals 16 ; breadth across brain-case 
18:2; bimeatal breadth 30°5; palatilar length 21; upper 
tooth-series 9°6 ; oblique diameter of p* 4. 
