138 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
Upper incisors well developed, distinctly projecting forward and 
forming a continuous row almost from canine to canine (the dia- 
stema less than width of outer incisor). Crown of inner tooth longer 
than high, the cutting edge straight, slightly oblique, the posterior 
surface flat and almost parallel with anterior surface. Outer tooth 
shorter, though with cutting edge in line with that of inner, its 
crown more oblique, though of about the same area. Lower incisors 
well developed, completely or nearly filling space between canines, 
the crowns very low and about as broad as long, the outline roundish 
or subquadrate, the upper surface with a faint median ridge. 
Canines strong, simple, with slightly developed cingula and no 
secondary cusps, the upper with distinct anterior and posterior cut- 
ting edge. Upper premolars with narrow trenchant crowns, longer 
than high, triangular in outline when viewed from the side, the 
main cusp slightly in front of the middle, the styles obsolete. First 
and second lower premolars similar, but with lower crowns; third 
with crown distinctly widened posteriorly. First and second upper 
molars with nearly half of the crown occupied by a conspicuous 
pit-like depression on the inner side of which is the narrow but 
distinct protocone, and on the outer side the paracone, metacone, 
and mesostyle. Parastyle and metastyle small, and commissures 
low; this, together with the distinct pushing outward of the para- 
cone and metacone causing a noticeable flattening and widening of 
the W -pattern. Third upper molar with crown area more than 
half that of second, the median depression well developed, as are 
the protocone, paracone, and elongated, low parastyle; mesostyle 
and metacone somewhat reduced, and the three commissures distinct. 
Inner border of all three molars strongly convex. Lower molars with 
the usual five cusps present and distinct, the three teeth alike in form, 
but the last slightly smaller than either of the others. While the 
cusps are well developed the commissures are obsolete, giving the 
crowns a peculiar multituberculate appearance when viewed from 
above. Skull with braincase large and elongate, but low, rounded 
and smooth. Rostrum somewhat shorter than braincase, low and 
weak. A small but distinct lachrymal inflation. Basisphenoid pits 
distinct but shallow. Audital bullae small, covering less than half 
surface of cochleae, their greatest diameter slightly more than width 
of basioccipital. Tail not as long as tibia, extending barely to middle 
of broad interfemoral membrane. 
Species examined. — Glossophaga antillarum (Rehn), G. elongata 
Miller, G. longirostris Miller, G. mutica Merriam, G. soricina 
(Pallas), and G. truei FI. Allen. 
