VESPEEIILIONIDJE. 169 



commences near the angle of the 

 mouth ; ears generally shorter 

 than the head, triangular or rhom- 

 boidal in outline ; tragus curved 

 inwards or straight ; muzzle nearly 

 naied in front of the eyes, with 

 well-developed glandular emi- 

 nences ; upper premolars not ex- 

 ceeding 2 — 2, tlie first premolar 

 minute or absent. 

 6". Premaxillary hones moderately 

 developed, occupying half the 

 space between the canines ; 

 upper inner incisors bifid, sepa- 

 rated from the canines by a 



2—2 , 1—1 



space; mc-g-, rarely -y-- 

 a. No lobular projection from the 

 lower lip near the angle of 



the mouth; tibise short. ... 6. VESPERuao, p. 183. 

 ^. A distinct lobular projection 

 near the angle of the mouth ; 



tibiae long 7. Ohalinolobus, p. 246. 



c' ' Premaxillary bones very narrow, 

 slender ; upper incisors unicus- 

 pidate, close to the canines ; 



1—1 

 inc. -g-. 



y. The first lower premolar small, 

 crushedin between the canine 

 and second premolar; mem- 

 branes thick, nearly naked . . 8. Scotophiltjs, p. 256. 

 ^ 8. The first lower premolar not 

 crushed in between the adj oin- 

 ing teeth; membranes thin. 

 _^ a. Tragus straight, outer mar- 

 gin convex ; interfemoral 



membrane nearly naked . . 9. Nycticbjus, p. 266. 

 /3'. Tragus curved inwards, 

 outer margin strongly an- 

 gular below ; interfemoral 

 membrane more or less 

 completely covered with 



hair 10. Atalapha, p. 267. 



&. The outer margin of the ear-conch 

 commences abruptly nearly oppo- 

 site the base of the inner margin 

 of the tragus ; ears generally as 

 long or longer than the head, 

 narrow, thin ; tragus long and 

 narrow, straight or curved out- 

 wards ; muzzle narrow and hairy 

 in front; upper premolars gene- 

 rally 3 — 3, the first premolar well 

 developed. 

 h". Nostrils tubular, projecting con- 

 siderablv beyond the extremity 

 of the muzzle; premolars 2r2 ■ ^^- Habpiocephalus, p. 276. 



