210 Mr. O. Thomas on small Mammals 



jnst reaching the level of the front edge o£ m\ while in 

 iV. vahiivianus they extend to the level of the back of the 

 first lamina of tiiat tooth. 



Dimensions of the type (measured in the flesh) : — 



Head and body 104 mm. ; tail 44 ; hind foot 20 ; ear 12. 



Skull: greatist lengtli 28; condylo-incisive length 25*5; 

 zygomatic breadth 13*7 ; nasals 10; interorbital breadth 5*2 ; 

 breadth of brain-case 12'8 ; palatilar length 11*4 ; palatal 

 foramina 6 ; postforaminal palate 4"1 ; upper molar series 3"5. 



Hah. as above. 



Type. Old male. B.M. no. 18. 12. 2. 37. Original num- 

 ber 194. Collected 30th April, 1918. 



This series of the long-clawed mole-like Murines of the 

 south is perhaps the most interesting part of Sr. Budin's 

 collection, and forms a very valuable accession to the 

 National Museum. 



16. Ctenomys haigi^ sp. n. 



S . 179, 180, 181, 184, 189 ; ? . 174, 185, 186, 187, 190. 

 Maiten, W. Chubut. 700 m. 



Allied to C. colburnij All., but smaller, with smaller 

 bullae. 



Size medium. Fur soft, fine and silky, hairs of back 

 about 11-12 mm. in length. General colour of upper surface 

 finely ticked greyish brown, near " drab," without median 

 darker marking on rump or crown, the top of the nose only 

 dark brown. Sides clearer grey, and the lower flanks rather 

 abruptly and prominently buffy (" light buff ") in continua- 

 tion with the buffy wash on the hairs of the under surface. 

 Forearms also prominently pale buffy both externally and 

 internally ; hind feet dull whitish. Tail grey on sides, 

 blackish above and terminally below, but this, as usual, is 

 variable in extent. 



Skull, as compared with that of C. colhurni as figured by 

 Allen *, similar in shape, but smaller and with decidedly 

 smaller bullae, which do not project backwards beyond the 

 level of the supraoccipital. Interparietal quite united with 

 parietals in all the specimens, the line of junction generally 

 marked by some discoloration. Bullae of average size, 

 markedly less swollen than those figured in the male 

 C. colburni. 



Dimensions of the type : — 



Head and body 165 mm. ; tail 70 ; hind foot 28. 



Skull: greatest length in middle line 40*2; condylo- 

 incisive length 38"7 ; zygomatic breadth 23"o ; nasals 14*7 j 

 * Mamm. S. Pat. pi. %iii. fip. 4. 



