404 Mr. O. Thomas on 



Fur of back about 6 mm. in length. General colour above 

 of the usual dark brown, the bases of the hairs lighter, their 

 tips blackish brown. Interfemoral membrane broad. 



Skull rather larger and broader than in Ch. minor. 

 Upper premolars shorter, less excessively compressed laterally. 

 Two anterior molars longer, narrower proportionally, the 

 posterior lobe particularly elongate, and with a well-marked 

 postero-external cusp, each of the teeth showing three distinct 

 cusps when viewed from the side. Last molar and lower 

 teeth about as in Ch. minor. 



Dimensions of the type : — 



Forearm 33 mm. 



Head and body 62; tail 8; lower leg and foot 21 ; 

 calcar 6*5. 



Skull : greatest breadth 8'5 ; interorbital breadth 4 ; 

 front of canine to back of m^ 7*8 ; length of />^ 0*8, jt>* 0*0, 

 m} 1-1, w2 1-1, jo^ 0-9, wi 1-0. 



llab. Yahuarmayo, S.E. Peru. Alt. 1200'. 



Type. Adult male. B.M. no. 12. 9. 5. 2. Original 

 number 709. Collected 7th February, 1912, by H. and C. 

 Watkins. One specimen. 



Taking as representing Peters's Surinam Ch. minor the 

 skull from the Oupare River, Lower Tapajoz, so determined 

 by Dobson (and there is a very strong Guianan cliaracter in 

 the fauna of that part of the Amazon), the present bat from 

 Peru differs in the proportional size of its teeth, but is other- 

 wise closely similar to it. Tlie Trinidad bat described by 

 Allen and Cliapman as Ch. t'ntertnedia is very probably the 

 same as Ch. minor j as those authors were deceived by Peters's 

 impossible measurement of 11 mm. for the calcar, an organ 

 drawn as about 5 mm. long in the more recently published 

 plate of the latter species (Chiropt. Mus. Berol. pi. viii. a). 



SCLERONYCTEEIS, g. n. {Glossophagince). 



Like Chceronycteris, but molars and premolars more normal 

 in structure. 



External characters, general shape of skull *, and dental 

 formula all as in Chceronycteris. Zygomata not ossified. 

 Chin unusually prominent, projecting both forwards ajid 

 downwards. Interfemoral membrane broad. 



Upper teeth. — Incisors comparatively large, the space be- 

 tween the inner pair not greater than the diameter of one of 



* The only skull is imperfect in the pterygoid region, so that the 

 relationship to Hylonycteris cannot be stated. That genus agrees with 

 (Jhtironyderis in its dental characters. 



