new Bats and Rodents from S. America. 409 



Skull longer than in any of the available specimens of 

 true darwini\ its interorbital region narrow, sharply edged, 

 concave niesially. 



Dimensions of the type (measured in flesh) : — 



Head and body 130 mm.; tail 140; hind foot 28; 

 ear 27. 



Skull: greatest length 34 ; condylo-incisive lengtii31*7; 

 zygomatic breadth 17'5 ; nasals 13"7 ; interorbital breadth 4; 

 palatilar length 16*2; palatal foramina 8'4; upper molai- 

 series 5'8. 



IJab. Las Vacas, Argentine slope of Uordilleia opposite 

 Mendoza. Alt. 2500 m. 



7ype. Old male. B.M. no. 2.2.5.51. Collected 15th 

 November, 1901, by P. O. Simons. Presented by Oldtield 

 Thomas. 



This Phyllods, found at the well-known station of Las 

 Vacas, on the Andean route between Mendoza and Santiago, 

 differs from the true Fli. darwini of the Chilian plains b}^ its 

 rather larger size, longer skull, sharply edged interorbital 

 region, long fur, and buffy-coloured rump. It was also 

 obtained by Philip Gosse at Puente del Inca, about 9000', 

 but there is no evidence as to whether these animals are able 

 to surmount the Andean chaiti (altitude of pass 12,800') or 

 whether the eastern and western races are now completely 

 isolated. 



None of Philippi's numerous species of " J/ms " that are 

 referable to PJiylhils dcmoihi are inhabitants of the high 

 And'S. 



Phyllotis andium, sp. n. 



Like Ph. haggardi, but tail much longer. 



Size and general characters as in haggardi. Colour a 

 little darker grey on the average, but the diiference is neitjier 

 great nor constant. Under surface dull greyish white slightly 

 tinged with buffy. Ears not immensely large, greyish 

 brown. Hands and feet white. Tail considerably and 

 uniformly longer than in haggardi, brown above, white 

 below. 



Skull slightly larger and heavier than in haggardi, smaller 

 thati that of darwini, with which it agrees in general 

 proportions. 



Dimensions of the type (measured in flesh) : — 



Head and body 115 mm.; tail 119; hind foot 25 ; 

 ear 21. 



Skull : greatest length 28*7 ; condylo-incisive length 2G-8 ; 



Ann. C& Mag. N. Hist. Ser. 8. Vol. x. 28 



