224 lilr. 0. Thomas on 



Quite similar to tlie many specimens tliat have been 

 received from Bridges, Hunt, Kalinowski, Garlep]i, and 

 others from localities north-westwards to Caylloma, Peru. 



4. PhyUotis arenarius, sp. n. 



? . Oniro, 3700 m. 

 3 ? . Lagunillas, 4000 ra. 



S . El Cabrado, 3500 m. 



S ? . Sucre, 3000 m. 



S $ . Potosi, 4000 m. 



2 c?,4 ?. Uyuni, 3670 m. 



Size and general characters about as in PJi. lutescens, but 

 coloration that of desert animals. Fur long, soft, and tine; 

 hairs of back about 15 millim. in length. General colour 

 above pale ftnvn, lined on the back witii dark brown ; sides 

 clearer and more butfy, the buffy often forming a clear lateral 

 line edging the ventral white. Under surface white, either 

 pure white or faintly tinged with buffy, not sharply defined 

 laterally ; the hairs everywhere dark slaty basally. A small 

 bright buffy spot often present on each side of the chest. 

 Face pale greyish, with scarcely any buffy tinge. Ears 

 fairly large, pale brownish, not contrasting with head. Ujiper 

 surface of hands and feet pure white. Tail well haired and 

 more or less pencilled at the tip, its u])perside fawn, darkening 

 terminally to dark brown ; sides and under surface white. 



Skull in size and shape closely similar to that of Ph. lu- 

 tescens. 



Dimensions of the type : — 



Head and body 118 millim. ; tail 114 ; hind foot, s. u. 26, 

 c. u. 27 ; ear 26. 



Skull : greatest length 30 ; basilar length 23"2 ; greatest 

 breadth 14"5; nasals 13x3'7; interorbital breadth 3*7; 

 breadth of brain-case 12*8 ; palate length 13*1 ; diastema 8*2 j 

 palatal foramina 7'5 X 2'5 ; length of upper molar series 4*9. 



Uab. Sandy plateau of Bolivia. Type from Uyuni. Alt. 

 3670 m. 



Type. Old male. P.M. no. 2. 2. 2. 34. Original number 

 1671. Collected 4th November, 1901. 



This I'hyllotis is evidently the representative of the Ph. 

 Jiaggardi-lutescens group in the desert parts of the Bolivian 

 plateau. Besides the specimens above enumerated Air. Simons 

 had already sent, in a previous consignment, examples 

 apparently referable to it from the desert-region near Are- 

 quipa, at the north-western end of the same faunal area. 



