144 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



As in Leptonycteris, m - has the appearance of a third molar. Lower 

 molars with the cusps all reduced in size, the metaconid largest. 

 Zygomata incomplete. Tail distinct, about half as long as femur, 

 extending scarcely to middle of broad interfemoral membrane. 



Species examined. — Lichonycteris obscura Thomas. 



Remarks. — This genus appears to be most nearly related to Lep- 

 tonycteris, with which it agrees in the very peculiar formula of the 

 cheek teeth. It is, however, even more aberrant, having lost the 

 lower incisors, and almost lost the W pattern of the upper molars. 



Subfamily HEMrDKRMnSTJE:. 



1838. Phyllostomina (part) Gray, Mag. Zool. and Bot, II, p. 486, Decem- 

 ber, 1838. 

 1855. Glossophagina (part) Gebvais, Exped. du Comte de Castelnau, Zool., 

 | Mamm, p. 40. 



1865. Vampyri (part) Petees, Monatsber. k. preuss. Akad. Wissensch., 

 I Berlin, p. 256. 



1866. Vampyrina (part) Gray', Proc. Zool. Soc. London, p. 113. 



1875. Vampyri (part) Dobson, Ann. and Mag. Nat. Hist, 4th ser., XVI, 



p. 350, November, 1875. 

 1878. Vampyri (part) Dobson, Oatal. Chiropt. Brit. Mus., p. 458. 



1891. Phyllostomatinw (part, Vampyrine division, part) Flower and 

 Lydekker, Mammals living and extinct, p. 672. 



1892. Phyllostomata (part) Winge, Jordfundne og nulevende Flagermus 

 (Chiroptera) fra Lagoa Santa, Minas Geraes, Brasilien, p. 24. 



Geographic distribution. — Warmer parts of America north to 

 southern Mexico and in the West Indies to Jamaica. 



Characters. — Teeth abnormal. First and second upper molars 

 with protocone greatly reduced (Hemiderma) or obsolete (Rhino- 

 phylla) , occupying entire very narrow inner edge of tooth ; paracone 

 and metacone large, trenchant; parastyle and metastyle present, 

 though small; mesostyle absent; an angular-concave commissure 

 nearly in line with main axis of toothrow connects the outer cones 

 and styles, but without forming any trace of a W pattern. Third 

 upper molar never half as large as first or second, either a practically 

 structureless remnant or at most with two low cusps, apparently the 

 paracone and parastyle. Lower molars with protoconid (in Hemi- 

 derma the hypoconid also) well developed and forming with its 

 commissures a median longitudinal cutting ridge, close to the middle 

 of which the rather small metaconid may be situated. (In Rhino- 

 phylla the metaconid is absent and the molars closely resemble the 

 premolars in form.) Paraconid and entoconid small or absent. 

 Rostrum, noseleaf , and tongue normal. 



History. — Except that Gervais associated the genus Hemiderma 

 with the Glossophagine bats in 1855, the Hemiderminae have been 

 almost universally referred without special comment to the Phyl- 



