from North-western Patagonia. 211 



interorbital breadth 7*1 ; least breadtli across brain-case 16*5; 

 Mifutal breailth 21"') ; breadth across bullaj exclusive of 

 imatus 22'5 ; piilatilar length 16"5 ; horizontal diagonal 

 lenj^th of buUaj 15*2 ; upper molar series, crowns 8*2, 

 alveoli 9. 



Ilah. as above. 



Type. Adult male. B.M. no. 18. 12. 2. 39. Original 

 number 180. CoUectod 24th April, 1918. 



This species diflers from C. colhuriii by its smaller size, 

 less swollen bullae, and less fulvous coloration. 



Named in honour of General Sir Douglas Haig, Com- 

 mander-in-Chief of the British armies. 



17. Ctenomys haigi lentulus, pubsp. n. 



S. 114,155,162; ?. 152. Pilctifieu, Upper Rio Negro. 

 1400 m. 



Like true haigi, but the gejieral colour browner and less 

 grey-ticked, the dull patch on the muzzle more inclined to 

 extend up on to the crown, the lower flanks more greyish 

 brown, without the strongly marked biiffy wash contrasting 

 with the dorsal colour which is found in every specimen of 

 haigi, and with the forearms also brownish, not buffy. 



Dimensions of the type: — 



Head and body 155 mm. ; tail 70 ; hind foot 30 ; ear 6. 



Skull : greatest median length 40 ; condylo-incisive 

 length 38*5 ; zygomatic breadth 23'5 ; nasals 15 ; inter- 

 orbital breadth 7*7 ; meatal breadih 25; breadth across 

 bulla? (exclusive of meatus) 25 ; upper molar series, ci owns 8, 

 alveoli 8*8. 



JJdh. as above. 



Type. Adult male. B.M. no. 18. 12. 1. 23. Original 

 nuniler 162. Collected 4th April, 1918. 



]\lo.-t readily disiingnislied from the Maiten tuco-tuco by 

 the absence of the light buiiy wash on flanks and forearms. 



18. Galea negrensis, sp. n. 



? . 139. Pikaneu, Upj-er Kio Negro. 1400 m. Col- 

 lecled 23r(l March, 1918. B.M. no. 18. 12. 1. 25. Type. 



(jitneial external characters of G. huUviensis. Colour 

 of back mixed blackish and bufty. Under surface whitish, 

 the belly-hairs broadly slaty basally, but with completely 

 whitf areas in the axillary and in;:uinal regions. Eyelids 

 wii.tish as usual, and a biifty-\vhiii>b patch at the base of the 

 priMctote ot the ear. Fore limbs with their whole inner and 

 npi er surtaces bufty wliiie ; iiaiids n)ore strongly bufiy. 

 Inner side of hind limbs also whitish ; the teet dull buffy. 



