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-internal cusp, its crown 
sharing the general reduction of transverse diameter to which all 
the upper cheek teeth are subjected. First lower premolar (pm 2 ) 
small, scarcely functional, crowded between second premolar (pm 4 ) 
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 m 1 and m 2 are subquad- 
rate in outline ; each of the larger teeth with slightly indicated hypo- 
cone ; m 3 with crown area less than half that of m 1 or m 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 bulhe 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 narroAv, 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 body ; 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 
