406 Mr. O. Thomas on 



connect the aberrant Chceronycteris and Hylonycteris with the 

 more normal-toothed members of the Glossophagince. 



PhyUotls magister, sp. n. 



.General characters of Ph. darwini ; size greater than in 

 any other species of the genus. 



Size conspicuously greater than in Ph. daricini. Fur of 

 medium length and thickness. General colour above grizzled 

 drabby grey, with sligiit buflfy suffusion. Under surface dull 

 creamy whitish, the bases of the hairs slaty. Ears large, as 

 in the allied species ; pale brown. Hands and feet large and 

 heavy, their upper surfaces white. Tail long, well Jiaired, 

 blackish brown above, white below. 



Skull as in darwini, but conspicuously larger throughout. 

 Supraorbital edges not very sharply ridged. 



Dimensions of the type, measured in the flesh : — 



Head and body 152 mm.; tail 158; hind foot 32; 

 ear 29. 



Skull: greatest length 36*8 ; condylo-incisive length 34-2 ; 

 zygomatic breadth 18'5 ; nasals 15*3; interorbital breadth 

 4'5 ; palatilar length 16"6 ; palatal foramina 9 ; upper molar 

 series 6. 



Hah. Arequipa, Peru. Alt. 2300 m. 



Type. Adult male. B.M. no. 0. 10. 1. 31. Original num- 

 ber 997. Collected 29th March, 1900, by Perry O. Simons. 

 Presented by Oldfield Thomas. 



This fine species is represented by a single specimen caught 

 at the same place as a number of examples representing the 

 northern form of Ph. daricini^ a species in which the iiead 

 and body length rarely exceeds 125 mm. and the skull 

 length 33 mm. Its large molars and heavy rat-like feet also 

 considerably surpass those of that animal. 



Phyllotis danvini posticah's, subsp. n. 



Proportions about as in true darwini. Fur very long, 

 summer specimens with the wool-hair of the back very thick, 

 about 15 mm. in length. General colour dark, little buffy, 

 about as in typical Cliilian darv:ini or in hitescens, therefore 

 very different from the paler and more buffy forms inhabiting 

 Southern Peru and the highlands of Bolivia. Tail rather 

 longer than head and body, thickly hairy, the hairs practi- 

 cally hiding the scales, blackish above, sharply contrasted 

 white below. 



Skull as in true daricini, the teeth slightly larger. 



