418 Mr. O. Thomas on 



5. Akodon gossei, sp. n. 



S . 916, 919, 921, 930, 934, 935, 943, 944, 947, 948, 950, 

 952, 959, 967, 988 ; ? . 909, 926, 927, 968. La Invernada. 



A small species of a pale pinkish colour, very like a pale 

 Evotomys. 



Size decidedly less than in the last species, the teeth in 

 particular very much smaller. Fur rather thin, hairs of back 

 8-9 mm. in length. General colour above greyish, washed 

 on back with cinnamon or buffy of various intensity ; the 

 head, nape, and sides more greyish. Under surface washed 

 with pale buffy, the bases of the hairs slaty. Ears greyish or 

 buffy, darker on the proectote, more whitish on the proximal 

 part of the metentote, which is darker terminally ; a whitish 

 or buffy patch on the side of the head behind their bases ; 

 these whitish marks on and behind the ears form an obvious 

 characteristic of the species. Hands and feet white or buffy 

 white. Tail about as long as the body without the head, 

 brown or buffy brown above, whitish or pale buffy below. 



Skull of normal shape. Supraorbital edges squared. 

 Palatal foramina reaching to the level of the first third of m 1 . 

 Bulla? fairly large. 



Dimensions : — 



Of the type : head and body 92 mm. ; hind foot 19. 



Of the largest of Sr. Budin's specimens, measured in the 

 flesh : head and body 96 ; tail 66 ; hind foot 19 ; ear 13. 



Skull (type) : greatest length 24 ; condylo-incisive length 

 22 ; zygomatic breadth 12"5 ; nasals 8*4 ; interorbital breadth 

 4*2 ; breadth of brain-case 11*7 ; palatilar length 10 ; palatal 

 foramina 5*2 ; upper molar series 3*8. 



Hob. (of type). Puente del Inca, Andes of Mendoza. 

 Alt. 10,000'. 



Type. Adult, but not old, female. B.M. no. 98. 3. 21. 5. 

 Original number 3. Collected January 1897 by Philip 

 Gosse. Presented by E. A. Fitzgerald. Three specimens 

 from the type-localit}^, two from Las Vacas, in the same 

 district, alt. 2500 m. (P. O. Simon*), one from "Chili" 

 (Philippi), and the present series examined. 



This species has long been known to me, but under the 

 name of andinus, Phil., for there is a young specimen of it in 

 the small collection, received, as I believe, from Dr. Philippi 

 himself, with the name of "Mas andinus " upon it, a determina- 

 tion I had hitherto accepted. 



But on looking up Dr. Philippics two descriptions and 

 figure of his M. andinus*, I find that that is evidently quite 



* Arch. f. Nat. 1858, i. p. 77; An. Mus. Nac. Chile, xiv., Zool. i\lu- 

 rideos Chile, p. 22, pi. vi. fig-. 2 (1900). 



