180 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
canine. Lower incisors much larger than in Desmodus or Dicemus , 
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 ahnost 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 2 ) is not oblique, but has the cutting edge as high in front 
as behind and rising to a point at middle; third (m x ) similar to first, 
but intervening tooth (pm 4 ) with cutting edge almost straight; pos- 
terior tooth (m 2 ) 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 
iower incisors of Cynocephalus and Colugo , 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 Desmodontidoe, retaining as it does its calcar, i m 2 , and m 2 , and 
showing to a less degree than the other genera the reduction of the 
rostrum and the high development of the cutting teeth. 
Family AATALID.E. 
1831. V espertiliones {V espertilionidce) (part; Vespertilionina, part) Bona- 
parte, Saggio cli uria distrib. metodica degli Anim. Vert., p. 15. 
1838. V espertilionidce (part; Vespertilionina, part) Gray, Mag. Zool. and 
Bot., II, p. 494, December, 1838. 
1840. Gymnorhina (part; Vespertilionina, part) Wagner, Schreber’s Saug- 
tbiere, Supplements, I, p. 483. 
1855. [Pliyllostomidw] “ Pliyllostomides ” (part; Vampyrina, part) Gervais, 
Exped. du Comte de Castelnau, Zool., Mamm., p. 44 GSpectrellum’— 
Natalus). 
1855. [V espertilionidce] “ V a spertilionides ” (part; Vespertilionina, part) 
Gervais, Exped. du Comte de Castelnau, Zool., Mamm., p. 52 (Nyctiellus) . 
1855. Vampyrina (part; Spectrellum=N atalus) Gervais, Exped. du Comte 
de Castelnau, Zool., Mamm., p. 44. 
