6. SACCOPTERYX. 371 



8. Ears united ; wings from the tarsus ; fore- 



arm l"-7. (Subg. Peromjrmis, Ptra.) . . 4. « leucoptera, p. 374. 

 c. Wing-sac opening in the centre of the ante- 

 brachial membrane, the aperture directed 

 inwards ; iu other respects as in sub"'. 



^•opteryx ° guljg. Balantioptbryx*. 



«. Xhe posterior edge of the wing-mem- 

 brane margined with white ; forearm 



, ,,,.. 6. S. plieata, p. 37(5. 



a. vv mg-sac opening on the inner side of the 

 antebrachial membrane near the shoulder; 

 ears separate; wings from the base of 

 the toes ; premaxillary bones very small ; 

 facial bones flattened above, with a longi- 



tudinal central groove °. . Subg. Oentronycteris. 



Q. i!-ars slightly longer than the head; fore- 

 arm l"-75 6. S. calcarata, p. 370. 



1. Saccopteryx leptura. 



Vespertilio lepturus, Schreher, Saugeth. i. p. 173, pi. 57 (1775). 

 Saccopteryx lepturus, Illiger, Prodr. St/st. 3Iammal. p. 121 (1811) ; 



Krauss, M-ichson's Archivfiir Naturgesch. 1846, p. 178, fig. 6. 

 Saccopteryx leptura, Peters, MB. Ahad. Berl. 1867, p. 471. 



Head scarcely raised above the face-line : eyes large ; nose promi- 

 nent, raised above the muzzle and projecting slightly in front, with 

 a narrow but distinct groove above between the nostrils ; nasal aper- 

 tures opening close together in front, directed forwards, downwards, 

 and slightly outwards ; extremity of the muzzle projecting slightly 

 beyond the lower lip; lower lip with a vertical groove in front. 

 Ears narrow, somewhat shorter than the head ; inner margin of the 

 ear-conch arising slightly above the eye, convex in lower, straight 

 in upper two thirds, tip narrowly rounded off, outer margin deeply 

 concave in upper one third, then convex, slightly concave opposite 

 the base of the tragus, terminating midway between the base of the 

 tragus and the angle of the mouth in a slightly convex lobe ; tragus 

 longer than broad, inner margin straight or slightly concave, outer 

 margin with an indistinct triangular lobe above the base, then 

 straight, slightly convex above, with small, rounded, bead-like pro- 

 jections, tip rounded off. 



Antebrachial membrane in male with a deep pouch, the mouth of 

 which extends along the forearm from a point near the anterior and 

 outer margin of the membrane backwards and inwards towards the 

 elbow, 0"'3 inch in length f; in the female this sac is quite rudi- 

 mentary. The interior of the sac is lined with a glandular membrane, 

 which is deeply wrinkled, and contains an unctuous substance. 



Wings from the ankles or tarsi; interfemoral membrane very 

 large, extending, when expanded, to a considerable distance beyond 

 the feet ; calcanenm as long as the tibia. 



* Genus Balantioptcryx, Ptrs. I. r. ^ 



t See an excellent representation of this sac, viewed from the under surface 

 of the antebrachial membrane, in Schreber, S.iugethiere, i. pi. Ivii. 



2b2 



