6. SACCOPTEEYX. 369 



c. 5 ad., nl. Demeiai-a. G. E. Dobson, M.B. [E.]. 



d. cJ ad., al. Surinam. Dr. Peters [P.]. 



e. (S ad., al. Surinam. Mr. Bartlett [C.]. 

 f-i. d & 2 ad., al. Upper Amazons. Mi'. Bartlett "C.l. 

 J, k. ad. sks. Lake of Haulhaja, Santa Mr. Bartlett [C.j. 



Cruz, Peruvian Amazons. 

 /, "i. 2 ad., al. 



6. SACCOPTERYX. 



Saccopteryx, lUii/er, Prodi: Syst. Mavmal. p. 121 (1811). 

 Taphozous, Geofroy (in part), Bescript. de VEgypte, ii. p. 126 (1812). 

 Taphozous et Urocryptiis, Temminck (in part), Mmoor. Mammal, u. 



pp. 294, 300 (1835-41). 

 Saccopteryx, Peropteryx, Cormura, Balantiopteryx, Centronycteris, 



Peters, MS. Akad. Berl. 1867, pp. 471-476, and 1872, p. 701. 



Ear-conch very similar in general outline to that of Emhallonura, 

 but the tragiis is never expanded above, generally slightly narrowed 

 at the upper third ; forehead flat or slightly concave ; extremity of 

 the muzzle projecting more or less beyond the lower lip, terminated 

 by the circular nasal apertures, which are close together ; ante- 

 brachial membrane iviih a ■pouch opening on its upper surface, well 

 developed in males, rudimentary or absent in females ; wings from 

 the ankles or from the sides of the feet as far as the metatarsus ; 

 interfemoral membrane and tail as in Emballonura, 



Dentition. Inc. ~, o. i^, pm. |^, m. ^. 



Upper incisors feeble, unicuspidate, closer to each other than to 

 the canines. 



Range. Neotropical Region (Mexican and Brazilian Subregions). 



The peculiar glandular sac in the antebrachial portion of the 

 wing-membrane in the species of this genus, first noticed by Schreber 

 in S. leptura*, has been subsequently described by Dr. J. E. Grayt 

 and by Hr. Keinhardt+; and Dr. Peters has divided the genus 

 Saccopteryx into several genera, mainly distinguished by the posi- 

 tion of this sac, which in different species occupies different parts of 

 the membrane. 



The wing-sac is developed only in the male ; in the female it is 

 quite rudimentary, its position being indicated only by two small 

 folds of skin, scarcely raised above the surface of the membrane, 

 which correspond to the margins of the mouth of the sac in the 

 male. In the adult males of the different species a valvular longi- 

 tudinal opening is found on the upper surface of the antebrachial 

 membrane. This opening leads into a small pouch (in some species 

 large enough to hold a pea), which projects abruptly from the under 

 surface of the membrane. The interior of this pouch is lined by a 

 "landular membrane, which secretes an unctuous substance of a 

 reddish colour, with a strong ammoniacal odour. In some species 



* See p. 371 and footnote. 



t Ann & Mag. Nat. Hitt. 184.'), p. 279. J L.c 1849, p. 386, 



2 B 



