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 cusp. 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 STTTJRJSTIRIZNrJE:. 



1855. Stenodermina (part) Gekvais, Exped. du Comte de Castelnau, Zool., 

 Mamm., p. 32. 



1865. Stenodermata (part) Peters, Monatsber. k. preuss. Akad. Wissensch. 

 Berlin, p. 257. 



1866. Stenodermina (part) Gbay, 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. Phyllostomatinm (part; Stenodermatine division, part) Flower and 

 Lydekkeb, 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. Kostrum, tongue, and noseleaf normal. 



