CHxJBOPTERA. 123 



WHITE OX-TAILED BAT. 



PLATE II. Fig. 1. 

 Dididurus allus, or Freyreysii of P. MAX. 



ON this species, of which we here give a figure, the 

 genus was established ; offering a structure, in the 

 form and composition of the parts of the tail, with- 

 out example in any other class of mammalia, and 

 perhaps not in the animal kingdom ; the coccygeal 

 bones running out jointed into two horny pieces, 

 covered by the skin of the body, forming a kind of 

 box of two valves, applied horizontally, and capable 

 of separate motion. It was found by Mr. Freyreise 

 upon cocoa trees, near Rio Pardo, in Brazil. 



Genus NOCTILIO, Cuv. and Geoff. Hare -lipped 

 Bats. Head broad; muzzle short, swelling cleft, 

 furnished with warts or tubercles ; nose confounded 

 with the cleft lips ; nostrils almost tubular, promi- 

 nent ; ears small, isolated, with auricular operculum 

 internal. Dent. form, incis. f , can. \-\, mol. -$ = 

 \ f = 28. The interfemoral membrane very broad, 

 projecting with two obtuse angles ; tail mostly en- 

 veloped, but free at tip. Inhabits South America. 

 There are two species known of this genus. 



The genus AELLO of Leach., Linn. Trans, xiii., 



