82 BULLETIN 57, UNITED STATES NATIONAL MUSEUM.. 



Characters. — Dental formula : 



-2-.1. 4567 . 1-1 1<L 1-1 3-3 



1 2 _. i. _ 2 _ 4 5 6 7 t 2 - 2' c 1 - V pm 2 - 2' m 3 - B -/8, 



Upper incisors, oblique, styliform, minute, barely penetrating 

 the gum, the crowns 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 postofbital 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 bulla? 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. Vespertilionidw (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. Vespertiliones (Vespertilionidw) (part; VcspcrtUinnlna/purt) Bona- 

 PARTE,"Saggio di una distrib. metodica degli Anim. Vert., p. 15. 



1838. Vespertilionidw (part; NoctiUonina, part) Gray, Mag'.' ZcKriand Bot 

 II, p. 498, December, 1838, ' 



