Mammals from Bolivia. 225 



5. Phyllotis hirlipeSj sp. n. 



3 c?, 1 ?. Oiuro, 3700 m. 

 cJ, 2 ? . Challapata, 3800 m. 

 ? . Pampa Aullaga, 3S00 m. 



Size small ; tin- soft and fine, hairs of back about 11 milliin. 

 in length. General colour bright sandy buff, indistinctly 

 lined on the back with brown. Sides brighter buff, a line 

 almost matching Ridgway's " pinkish buff" edging the white 

 of the belly. Under surface pure snowy white, tlie hairs 

 white to their roots *. Face but little greyer than back. 

 Ears pale greyish, the back of their anterior halves rather 

 browner. Upjjer surface of hands and feet pure white. 

 Palms (except pad at base of pollex) and soles thickly clothed 

 with stiff white hairs, the pads being obsolete, the whole 

 structure being just as in the African Gerhillus, subgenus 

 GerbilluSy and showing a precisely similar adaptation to 

 desert life; tips of digits naked. Tail about the length 

 of the head and body (ranging from 10 raillim. shorter to 

 7 niillim. longer), hairy, finely pencilled, whitish throughout, 

 on theupperside slightly darker terminally. 



Skull much as in the other small species of the group; 

 interorbital region narrow, flattened into sharply square but 

 unbeaded edges, which strongly diverge posteriorly; no trace 

 of parietal ridges. Front edge of zygoma-root not hollowed 

 out. Palatal foramina reaching to the level of the anterior 

 lamina of m\ 



Dimensions of the type : — 



Head and body 90 millim. ; tail 97 ; hind foot, s. u, 2-4, 

 c. u. 25 ; ear 20. 



Skull : greatest length 25"3 ; basilar length 20 ; greatest 

 breadth 13'5 ; nasals, length 9'8 ; interorbital breadth 4 ; 

 breadth of brain-case 12 ; diastema 68; palatal foramina 5*9; 

 length of upper molar series 3"8. 



JJab. Keighbourhood of Lake Poopo. Type from Challa- 

 pata, 3750 ra. 



2'i/pe. Male. B.M. no. 2. 2. 2. 43. Original number 

 1657. Collected 29th October, 1901. 



This most interesting little mouse rivals Fh. gerhillusm tiie 

 adaptation of its coloration to desert conditions and exceeds it 

 in its resemblance to the more typical gerbilles by the hairi- 

 ness of its palms and soles, in which character it is unique in 

 the group. 



6. Andinomys edax, Thos. 

 P. Z. S. 1902 (Feb. 18th). Abstract in ' Nature.' 



cJ ? . El Cabrado, 3500 m. 



* Philippi's " Mus capita '' has only " the points " of the belly-hairs 

 ■white, their bases bein|; presumably slaty. 



