180 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



canine. Lower incisors much larger than in Desmodus or Diwmus, 

 forming a continuous convex row, separated, however, from canines 

 by distinct spaces. The edges of the teeth are slightly recurved over 

 the pits that receive tips of upper incisors, and when viewed from in 

 front the upper surface is almost straight. The crowns in this 

 view are fan-shaped, that of the inner tooth about as long (on cutting 

 edge) as high, that of outer decidedly longer than high, and slightly 

 one-sided, the inner border being longer than outer. Cutting edge 

 of inner tooth with four equal beadlike lobes, that of outer with 

 seven similar lobes. Upper cheek teeth as in Desmodus, except for 

 the presence of the minute, structureless, styliform m 2 , the point of 

 which barely reaches level of cutting edge of the other teeth. Lower 

 cheek teeth differing in several details from those of Desmodus; the 

 first (pm ,) is not oblique, but has the cutting edge as high in front 

 as behind and rising to a point at middle; third (m J similar to first, 

 but intervening tooth (pm J with cutting edge almost straight; pos- 

 terior tooth (m ,) similar to second, but smaller. 



Species examined. — Diphylla ecaudata Spix. 



Remarks. — Diphylla is recognizable externally by its short, broad 

 ears, short thumb without pad on underside of metacarpal, and by 

 the presence of a minute though evident calcar to which the very 

 narrow uropatagium extends. Its most striking characters are, how- 

 ever, the form of the mandible, the tooth formula, and the structure 

 of the lower incisors. The fan-shaped, seven-lobed outer lower in- 

 cisor is unique among bats, and, so far as I know, there is no tooth 

 similar to it in other mammals. In a certain way it suggests the 

 lower incisors of Cynocephalus and Oolugo, but the lobation is con- 

 fined strictly to the edge. Except for the remarkable development 

 of the lower incisors, Diphylla appears to be the least specialized of 

 the Desmodontidse, retaining as it does its calcar, i •", in °, and m ,, and 

 showing to a less degree than the other genera the reduction of the 

 rostrum and the high development of the cutting teeth. 



Family NATALID^. 



1831. Vespertiliones (Vespertilionida') (part; VespertiJioiilnu. part) Bona- 

 parte, Saggio di una distrib. metodiea degli Anim. Vert., p. 15. 



1838. Vespertilionida- (part; Vespcrtilionina, part) Gray, Hag. Zool. and 

 Bot, II, p. 404, December, 1838. 



1840. Gynmorhina (part; Tcspcrtilionhia, part) Wagner, Sebreber's Saug- 

 tbiere, Supplement!!., I, p. 483. 



1855. [Phyllostomirta] " Phyllostomides " (part; Yawpi/riiw, part) Gervais, 

 Exped. du Comte de Castelnau, Zool., Mamni., p. 44 ('8pectrcllum'= 

 Wattthm). 



1855. [VcyirrtilionidiV] " Vespertilionides " (part; Vespcrtiiioiiina, part) 

 Gervais, Exped. du Comte de Castelnau, Zool., Manim., p. 52 (Xifrtiellus). 



1855. Yampitrina (part; Spcvircllum^Natahis) Gervais, Exped. du Comte 

 de Castelnau, Zool., Mamni., p. 44. 



