near Tinogasta, Catamarca. 119 



to their bases, but laterally they have pale slaty bases; line 

 of demarcation not strongly marked. Ears large, with whitish 

 tufts at their anterior base and on the neck behind them ; their 

 surface brown flesh-colour with fine white hairs scattered over 

 them. Hands and feet white. Tail long, hairy, becoming 

 heavily tufted terminally, the proximal half buffy below and 

 buffy mixed with blackish above, the terminal tuft either 

 mixed buffy and dark blackish brown throughout or the end 

 wholly blackish brown ; end-hairs attaining over 40 mm. in 

 length. 



Skull as above described. 



Dimensions of the type : — 



Head and body 165 mm. ; tail 179; hind foot 345 ; 

 ear 25*3. 



Skull: greatest length 44; condylo-incisive length 41*7; 

 zygomatic breadth 21 ; nasals 15 X 4*7 ; interorbital breadth 

 9'5 ; least breadth across brain-case 17*5 ; bi-meatal breadth 

 21*6; palatilar length 16"5 ; palatal foramina 3*7 X 3*2 ; 

 diagonal horizontal length of bulla 15 ; upper molar series 

 (crowns) 8" 6. 



Type. Adult female. B.M. no. 20. 5. 11. 33. Original 

 number 880. Collected 5th January, 1920. 



Sr. Budin says of this animal that the specimens were 

 captured among some large rocks which had fallen from a 

 cliff in a ravine where there was a little water. It appeared 

 to be very rare, as he was only able to find two of its habita- 

 tions, close to each other, and none in any of the other ravines 

 in the neighbourhood. It was also entirely unknown to the 

 natives. 



7. Ctenomys coludo, sp. n. 



cJ. 849, 870, 874, 879, 885, 891; ? . 836, 877. 



A rather large pale species, with comparatively long tail. 



Size fairly large, though less than in G. knighti. Fur 

 rather thin and poor. General colour above pale, about as in 

 C. juris, paler than in most species, though not so pale as 

 in luteolus and opimus ; dorsal colour most nearly matching 

 " sayal brown " ; sides and under surface little paler. Area 

 round ears without special markings. Hairs of hands and 

 feet dull whitish. Tail rather longer than usual in the genus, 

 dull brown along the top, though some of the crest-hairs are 

 whitish ; sides and below dull white. 



Skull rather slender, the interorbital region and brain-case 

 narrow. Nasals broad in front, evenly narrowed backwards. 



