156 BULLETIN 51, UNITED STATES NATIONAL MUSEUM. 
Genus YAMPYRODES Thomas. 
1900. V ampyrodes Thomas, Ann. and Mag. Nat. Hist., 7th ser., V, p. 270. 
March, 1900 (subgenus of V ampyrops) . 
Type-species. — V ampyrops caracciolce Thomas. 
Geographic distribution . — Island of Trinidad. 
Number of forms. — The type is the only species yet known. 
Characters. — Similar to V ampyrops , but with only 2-2 upper mo- 
lars, and these conspicuously differing from each other in form, owing 
to the reduction of the metacone in the second to a mere trace. 
Species examined. — V ampyrodes caracciolce (Thomas). 
Remarks. — -Although V ampyrodes was originally defined as a sub- 
genus of V ampyrops , it seems quite worthy of recognition as a genus. 
The third upper molar in V ampyrops is a well-developed tooth, the 
presence or absence of which would cause, contrary to the condition 
in Artibeus , a distinct difference in the form of the maxillary at back 
of toothrow. A character of more importance is furnished by the 
suppression of the metacone in the second molar. 
Genus VAMPYRESSA Thomas. 
1900. Vampyressa Thomas, Ann. and Mag. Nat. Hist., 7th ser., V, p. 270, 
March, 1900 (subgenus of Vampyrops). 
Type-species. — Phyllostoma pusillam Wagner. 
Geographic distribution. — Brazil. 
Number of forms . — The type is the only species thus far dis- 
covered. 
Characters. — Dental formula : 
-2 3 . 1 . - - 3456 -. 2-2 1-1 _ 2-2 
1 2 -. 1 . - 2 - 4 5 6 - *2 - 2 ’ 1 - 1 ’ V 2-2 
m 
2-2 
2-2 
= 28 . 
In general like Yampyrops but molars only ^ _ their surface 
sculpture much more distinct; middle upper incisor faintly bifid; 
metacone of m 2 so reduced that the tooth is irregularly pyriform in 
outline, the narrower portion (paracone) outward; first lower molar 
without cusps on inner side, the general appearance of the tooth not 
very different froih that of last premolar. 
Species examined. — V ampyressa pusilla (Wagner). 
Genus VAMPYRISCUS Thomas. 
1900. Vampyriscus Thomas, Ann. and Mag. Nat. Hist., 7th ser., V, p. 270, 
March, 1900 (subgenus of Vampyrops) . 
Type-species. — Chiroderma bidens Dobson. 
Geographic distribution. — Peruvian Amazon region. 
Number of forms. — One, the type species. 
