82 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
Characters. — Dental formula : 
- 2-. 1. 4567.1-1 1-1 1-1 3-3 
1 2 1. - 2 -4 5 6 7 * 2-2’ c \-Y>P m .2-2’ m 3 - B 
Upper incisors, oblique, styliform, minute, barely penetrating 
the gum, the crotvns scarcely differentiated from the shafts, 
and hardly exceeding tips of premaxillaries. Lower incisors equal, 
in contact with each other, but separated from canines by spaces 
about half width of outer tooth, their crowns with distinct outer 
and inner lobe and a minute, sometimes obsolete, median lobe. 
Canines simple, without distinct cingulum, the upper with well- 
developed anterior and posterior cutting edges. Cheek teeth normal, 
without noticeable peculiarities of any kind. Upper premolar 
(pm 3 ) with small but distinct anterior outer cusp. Molars with 
broad inner ledges, but no hypocone. Third upper molar with dis- 
tinct metacone, mesostyle, and three commissures. Skull (fig. 11) 
without postorbital processes, but with lachrymal region distinctly 
swollen. Combined breadth of nasals greater than length. Pre- 
maxillaries tapering upward, in contact anteriorly, but not fused. 
Audital bullse large, the outline on inner side flattened, but not 
emarginate. Externally characterized by the long tail, about equal 
to head and body in length and far exceeding the rather narrow 
interfemoral membrane. Ears rather large, extending a little be- 
yond nostril when laid forward, broadly joined across forehead by 
deep band of membrane; antitragus low, ill defined; tragus large, 
membranaceous, not peculiar in form; keel barely indicated. Sides 
of muzzle much swollen laterally, the median region occupied by a 
deep, broad, longitudinal groove, which becomes almost pitlike poste- 
riorly beneath ears. Nostrils opening forward by oblique slits (closed 
in alcoholic specimens) on the surface of an ill-defined pad, the 
upper edge of which is surmounted by a ridgelike, rudimentary 
noseleaf . Lips neither swollen nor wrinkled. 
Species examined. — Rhinopoma microphyllum (Briinnich) and R. 
cystops Thomas. 
Remarks. — The species of Rhinopoma are easily recognizable by 
the broad muzzle with its rudimentary, ridgelike noseleaf, very pe- 
culiar nostrils, and the excessively long slender tail. 
Family EMBALLONURID.E. 
1821. Vespertilionidce (part; Race 1, part) Gray, London Medical Reposi- 
tory, XV, p. 299, April 1, 1821. 
1827. Rhinolophina Lesson, Man. de Mammalogie, p. 81 (part). 
1831. V espertiliones (V espertilionidw) (part; V espertilionina, part) Bona- 
parte, Saggio di una distrib. metodica degli Anim. Vert., p. 15. 
1838. Vespertilionidw (part; Noctilionina, part) Gray, Mag. Zool. and Bot, 
II, p. 498, December, 183§, 
