THE FAMILIES AND GENERA OF BATS. 
155 
ter it somewhat suggests V ampyrops, but the rostrum is deeper, while 
the dental peculiarities at once separate the two genera. The most 
convenient means of recognition is furnished by the upper incisors; 
these in Uroderma are subequal and bilobed, in V ampyr ops strongly 
contrasted in size, and the inner with cutting edge entire. 
Genus VAMPYROPS Peters. 
1860. Platyrrhinus Saussure, Rev. et Mag. de Zool., 2 e ser., XII, p. 429. 
October, 1860. Not Platyrhinus Clairville, 1798. 
1865. Vampyrops Peters, Monatsber. k. preuss. Akad. Wissensch., Berlin, 
p. 356. 
1878. Vampyrops Dobson, Catal. Chiropt. Brit. Mus., p. 522. 
1900. Vampyrops Thomas, Ann. and Mag. Nat. Hist., 7tk ser., V, p. 269, 
March, 1900. 
Type-species. — Phyllostoma lineatum Geoffroy. 
Geographic distribution. — Tropical America north to southern 
Mexico. 
Number of forms. — Nine species of V ampyr ops are now recognized. 
Characters. — Dental formula : 
-23. 1. --34 5 6 7 .2-2 1-1 2-2 3-3 QO 
1 2-.1. -2-4567*2 - 2’ C l-1’ 2-2’ m 3 - 3 
Upper incisors very unequal, the inner more than twice as high 
as outer, the crowns obliquely set, in contact at tip, the cutting edge 
entire; outer incisor low but well developed, completely filling space 
between canine and inner incisor, its cutting edge faintly bifid. 
Lower incisors small, equal, forming a nearly straight line between 
canines, their cutting edge faintly bifid. Canines and premolars es- 
sentially as in Artibeus. First and second upper molars with the 
outer cusps and both cingula well developed, as in Artibeus , but with 
hypocone absent or very rudimentary and with crushing surface 
nearly smooth. The two teeth are essentially alike in form. Third 
upper molar always present, slightly larger than in Artibeus , its 
crown area about one-eighth that of second molar. Lower molars 
with surface of crowns nearly smooth; the two outer cusps well 
developed in m t and m 2 though hypoconid is usually very low, par- 
ticularly in m 2 ; metaconid absent or represented by a minute rudi- 
ment in m 1? well developed in m 2 ; entoconid moderately large in 
both teeth; third lower molar with crown surface about one-fourth 
as great as that of second. 
Species examined. — V ampyr ops dorsalis Thomas, V. fumosus Mil- 
ler, V. helleri Peters, V. lineatus (Geoffroy), V. recifinus Thomas, 
V. umbratus Lyon, V. vittatus Peters, V . zarhinus H. Allen. 
