from North-western Patagonia. 211 
interorbital breadth 7:1 ; least breadth across brain-case 16°5 ; 
meatal breadth 24°5; breadth across bulle exclusive of 
meatus 22°5; palatilar length 16°5; horizontal diagonal 
length of bulle 15°2; upper molar series, crowns 82, 
alveoli 9. 
Hab. as above. 
Type. Adult male. B.M. no. 18.12. 2.39. Original 
number 180, Collected 24th April, 1918. 
This species differs from C. colburni by its smaller size, 
less swollen bulle, and less fulvous coloration. 
Named in honour of General Sir Douglas Haig, Com- 
mander-in-Chief of the British armies. 
17. Ctenomys haigi lentulus, subsp. n. 
g. 144, 155, 162; 9. 152. Pilcafeu, Upper Rio Negro. 
1400 m. 
Like true Aatgi, but the general 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 buffy 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 breadth 25; breadth across 
bullee (exclusive of meatus) 25 ; upper molar series, crowns 8, 
alveoli 8°&. 
Lab. as above. 
Type. Adult male. B.M. no. 18. 12.1. 23. Original 
number 162. Collected 4th April, 1918. 
Most readily distinguished from the Maiten tuco-tuco by 
the absence of the light buffy wash on flanks and forearms. 
18. Galea negrensis, sp. n. 
9. 139. Pilcafieu, Upper Rio Negro. 1400 m. Col- 
lected 23rd March, 1918. B.M. no. 18. 12.1. 25. Type. 
General external characters of G. boliviensts. Colour 
of back mixed blackish and buffy. Under surface whitish, 
the belly-hairs broadly slaty basally, but with completely 
white areas in the axillary and inguinal regions, Eyelids 
whitish as usual, and a buffy-whitish patch at the base of the 
proectote of the ear. Fore limbs with their whole inner and 
upper surfaces buffy white; hands more strongly buffy. 
Inner side of hind limbs also whitish ; the feet dull buffy. 
