NOTE ON CHIRODERMA VILLOSUM 883 
of Ch. doriae with the beautifully preserved spirit specimen of 
Ch. villosum. 
It will be seen that the differences in the upper incisors and 
anterior lower premolars amply necessitate the separation of 
these two very distinct species from one another. 
The upper incisors of Ch. villosum, as exemplified in the 
specimen before me, are especially remarkable on account of 
the fact that their position does not accord with that usually 
stated to be characteristic of the two genera Chiroderma and 
Vampyrops, namely « Inner upper incisors oblique », because 
they are perfectly straight. They really however differ equally 
essentially from those of Artibeus, which is said to have its 
« inner incisors straight », as in the latter these teeth are 
broad and have two subequal cusps, while in Vampyrops and 
Stenoderma the inner cusp of each tooth is much developed, 
and the outer aborted, the long single cusp in Ch. vellosum 
being as clearly the normal inner one as is the case in Ch. 
doriae and salvini. The number and relative development of the 
cusps therefore and not merely the direction of the teeth should 
be used for the distinction of the genera. i 
In making some remarks on the genus Vampyrops in 1889 (1) 
I found it necessary to remove from Chiroderma into Vampyrops 
two of the species placed by Dobson in the former genus, na- 
mely « Ch. » pusillum and bidens. With the new form added, 
there are therefore only left three species of Chiroderma, which 
may be arranged as follows: 
a. First lower premolar nearly flat-crowned, without a distinct cusp. 
Outer upper incisor about one fourth the height of 
the inner one. 
a‘ Inner upper incisors straight, not approaching each other 
terminally. Forearm 45-46mm. . . . . . . .1. Ch. villosum 
b’ Inner upper incisors oblique, touching at their tips. Fore-- 
arm 51 mm. . . + IS cole teal la Me OE SQIUCANII 
b. First lower premolar with a distinct anterior cusp. Outer upper 
: incisor about one half the height of the inner one. 
c/ Inner upper incisors oblique. Forearm 53 mm.. . . . . 3. Ch. doriae 
() Ann. Mag. N. H. (6) IV, p. 167. 
