THE FAMILIES AND GENERA OF BATS. 
147 
to inner edge of crown. Third upper molar a mere rounded, structure- 
less remnant lying directly in line with main cusps of the two 
preceding teeth and probably representing the paracone. Lower 
incisors strongly contrasted in size, the outer much reduced, the 
cutting edge of the inner obscurely trilobed, that of the outer bilobed. 
Lower molars essentially like lower premolars, differing only in 
their slightly greater length, slightly more distinct point, and in the 
presence of a low, barely indicated posterior cusj). This cusp appears 
as a mere backward prolongation of the cutting edge when teeth are 
viewed from the side, but in crown view it is seen to have a dis- 
tinctly indicated thickened base. It is probably the remnant of the 
hypoconid. No positive trace of the three inner cusps can be detected. 
The three teeth decrease uniformly in size from first to third. Skull 
with rostrum very short, the distance from orbit to gnathion barely 
equal to width of interorbital constriction. Dorsal profile of brain 
case deflected immediately behind orbits. Ears small, separate. Tail 
none. Interfemoral membrane narrow. 
Species examined. — Rhinophylla pumilio Peters. 
Remarks. — This genus represents the extreme stage of development 
of the Hemidermine type. It is not distantly related to Hemiderma , 
but the differentiation of the teeth has reached a much more extreme 
stage. 
Subfamily STIJRNIRIN . 
1855. Stenodermina (part) Gervais, Exped. du Comte de Castelnau, Zool., 
Mamm., p. 32. 
1865. Stenodermata (part) Peters, Monatsber. k. preuss. Akad. Wissensch. 
Berlin, p. 257. 
1866. Stenodermina (part) Gray, Proc. Zool. Soc. London, p. 116. 
1875. Stenodermata (part) Dobson, Ann. and Mag. Nat. Hist., 4th ser.,. 
XVI, p. 350. November, 1875. 
1878. Stenodermata (part) Dobson, Catal. Chiropt. Brit. Mus., p. 511. 
1891. Phyllostomatinw (part; Stenodermatine division, part) Flower and 
Lydekker, Mammals living and extinct, p. 675. 
1892. Stenodermata (part) Winge, Jordfundne og nulevende Flagermus 
(Chiroptera) fra Lagoa Santa, Minas Geraes, Brasilien, p. 24. 
Geographic distribution. — Tropical America, north to Jamaica and 
southern Mexico. 
Characters. — Teeth highly abnormal, .upper molars with distinct 
protocone, paracone, and metacone situated at extreme edges of 
crown, the space between occupied by a conspicuous longitudinal 
groove, continuous from one tooth to the next. Lower molars simi- 
larly grooved, the five typical cusps present at margins of crown, 
those on outer side low and indistinct, but metaconid and entoconid 
well developed. Rostrum, tongue, and noseleaf normal. 
