250 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



Canines heavy, but not peculiar in form, the upper with deep 

 longitudinal furrow on anterior face, and minute postero-basal cusp. 

 Upper premolar large, with distinct antero-iniernal cusp, its crown 

 sharing the general reduction of transverse diameter to which all 

 the upper cheek teeth are subjected. First lower premolar (pm ,) 

 small, scarcely functional, crowded between second premolar (pm J 

 and canine; second premolar large, slightly exceeding anterior sec- 

 tion of first molar. Upper molars normal, though the transverse 

 diameter of the crowns is so reduced that to 1 and to 2 are subquad- 

 rate in outline ; each of the larger teeth with slightly indicated hypo- 

 cone ; to a with crown area less than half that of to L or to 2 , the meta- 

 cone and third commissure very minute. Lower molars normal, 

 except that paraconid is very low in all three teeth, and entoconid 

 is absent in the third. Skull robust and heavily built, but rather 

 smooth, the sagittal crest barely indicated except in overhanging 

 occipital region, where it abruptly becomes prominent; lachrymal 

 ridge slightly developed, succeeded posteriorly by a small but dis- 

 tinct peg-like process; rostrum considerably more than half as long 

 as brain case, its lachrymal breadth about equal to its length, and 

 nearly twice its depth, its upper surface broadly and smoothly con- 

 vex ; palate entire anteriorly or with two lateral foramina, its lateral 

 concavity much more pronounced than the longitudinal; pterygoids 

 parallel; no basisphenoid pits; audital bullae small, their diameter 

 barely more than half distance between them, their form as usual 

 in the family. External form excessively robust and heavy, the 

 size of the only known species the maximum for the family. Ears 

 rather narrow, extending about half way from eye to nostril, widely 

 separate, angular above, the keel low,. broad, and rounded, the anti- 

 tragus suborbicular, distinctly thickened; tragus small, its anterior 

 edge adnate to side of head. Lips thickened, but scarcely expanded, 

 and not much wrinkled, the upper lip as well as the cheeks sparsely 

 beset with short, very stiff modified hairs, these crowded into a 

 shagreen-like mass anteriorly. Muzzle pad ill-defined, without 

 ridges or horny processes. Legs and feet unusually short and heavy, 

 the toes more independent of each other than in any other known 

 bat. Wing membranes attached to middle of back, the space between 

 them and body converted into a large pouch by a supplemental mem- 

 brane extending from under surface of humerus to side of bod}' ; this 

 pouch is completely closed when wings are folded, and in the female 

 it contains the nipple. Substance of interfemoral membrane and of 

 that- portion of wing that is exposed when closed much thickened ; 

 remainder of flight membrane thin and delicate, the dividing line 

 between the two sharply defined and extending from wrist to- ankle. 

 Whole animal essentially naked, but with a sprinkling of fine short 

 hairs on head, interfemoral membrane and under parts, and a ruff of 



