1901.] NATURAL SCIENCES OF PHILADELPHIA. 29^ 



the anterior fold bears a central thickening which is enlarged and 

 extends back toward the second fold which bears a central glandu- 

 lar structure, the third fold having a fold of skin of very consid- 

 erable lateral extent, the whole when pulled forward covering the 

 lower part of the face as a mask ; the female presenting rudimen- 

 tary folds on much the same pattern. Ears not exceeding the 

 muzzle and bearing a large, rather elongate, apically rounded lobe 

 on the internal margin; tragus moderately long, the external mar- 

 gin bearing several lobules, those near the apex usually little 

 developed. 



Limbs. — Forearm of moderate length, the thumb compressed, 

 the third finger moderately long. Tibia and foot rather weak. 

 Calcaneum short. 



Membranes and Fur. — Membranes moderately tough; the inter- 

 space between the fourth and fifth digits and the digital area of 

 the mesopatagium transversely gathered, the tension bars being 

 corded. Uropatagium reaching beyond the middle of the femora, 

 the margin haired. The fur extends upon the wing membrane to 

 a line drawn between the elbow and knee. 



Color. — General color above between drab and broccoli brown 

 (Ridgway's Nomenclature, PI. Ill), tending toward isabelline in 

 some alcoholic specimens and mummy bi'own (PL III) in others; 

 below isabelline. Membrane rather pale mars brown (PI. Ill), 

 the interspace between the second and third digits, the gathered 

 portions of the mesopatagium and of the interspace between the 

 fourth and fifth digits semi-transparent. 



Skull. — The skull is short and deep, with the rostral portion 

 very broad and steeply descending. Zygoma flaring. Palate 

 short, twice as broad as long, the cleft being acute-angulate ante- 

 riorly. Auditory bull?e flattened and not very conspicuous. The 

 figure given by Peters (^.c. ) is excellent and will show many 

 points hard to bring out in a description. 



Teeth. — Upper incisoi-s small, the central pair largest though 

 little exceeding the others in vertical extent; apex bluntly conic, 

 bifid or trifid; upper canines robust, with an anterior basal con- 

 cavity; upper premolars very unequal in size, the first half the 

 size of the second which bears several lobules on the posterior 

 margin; upper molars twice as broad as long, the crowns rather 

 flat with three principal cusps, the anterior one larger, the external 



