Mammals from North Argentina. 131 



4. Eligmodontia hirtipes jucunda, subsp. n. 



(J . 438, 447, 449, 450, 472, 474, 488, 495 ; ? . 451, 471, 

 478, 487. Abrapampa, 3500 m. 



" Caught in sandy soil. Inhabits deserted burrows of 

 Tuco-tucos." — E. B. 



Similar in proportions and other essential characters to the 

 typical hirtipes of the Lake Poopo region of Bolivia, but the 

 colour much less bright and buffy. Upper surface drab by 

 buff, much darker than the sandy buff of hirtipes — the rump 

 only more distinctly buffy. Hairs of sides with a lessened 

 but still perceptible whitish subterminal ring. Face greyish 

 buffy. Head and sides drabby buff. Under surface pure 

 white or creamy white to the bases of the hairs. An incon- 

 spicuous whitish area between eye and ear. Ears with pro- 

 ectote markedly darker. Hands and feet white. Tail white, 

 with a darker line generally present along its upper surface, 

 but this is absent in the oldest individuals ; in hirtipes the 

 darker line is scarcely ever perceptible. 



Skull as in hirtipes. 



Dimensions of the type : — 



Head and body 85 mm. ; tail 80 ; hind foot 22 ; 

 ear 18. 



Skull : greatest length 25 ; condylo-incisive length 22'2 ; 

 zygomatic breadth 13*2 ; palatilar length 10'2 ; palatal 

 foramina 5*7 ; upper molar series 4. 



Hah. as above. 



Type. Adult male. B.M. no. 19. 8. 1. 29. Original 

 number 488. Collected 5th February, 1919. 



This Jujuy representative of the beautiful little gerbil- 

 mouse of the desert-region round Lake Poopo may be readily 

 distinguished by its greyer and duller coloration. 



5. Bolomys albiventer, Thos. 



<? . 437, 439, 452, 460, 461, 464, 466, 470, 475, 480, 486 ; 

 ? . 404, 408, 419, 453, 465, 467, 485, 494. Abrapampa, 

 3500 m. 



<? . 501, 505, 519; ? . 504, 542. Casabindo, 4000 m. 



This is evidently the common vole-mouse (as the members 

 of the Akodon group might be termed) of the whole of the 

 high Octodontomys area of Bolivia and N. Argentina. 



6. Octodontomys gliroides, Gerv. & D'Orb. 

 tf . 513, 514, 521. Casabindo, 4000 m. 



