THE FAMILIES AND GENERA OF BATS. 155 



ter it somewhat suggests Vampyrops, 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 Vampyrops strongly 

 contrasted in size, and the inner with cutting edge entire. 



Genus VAMPYROPS Peters. 



1860. Platyrrhinus Saussube, Rev. et Mag. de Zool., 2" s6r., XII, p. 429. 



October, 1860. Not Platyrhinus Clairville, 1798. 

 1865. Vampyrops Peters, Monatsber. k. preuss. Akad. Wissensch., Berlin, 



p. 356. 

 1878. Vampyrops Dobson, Catal. Cbiropt. Brit. Mus., p. 522. 

 1900. Vampyrops Thomas, Ann. and Mag. Nat. Hist, 7th 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 Vampyrops are now recognized. 

 Characters. — Dental formula : 



-2 3. 1. --34567 . 2-2 1-1 2-2 3-3 



12-. 1. -2-4 5 6 7*2-2' C l-l'^ m 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 to x , 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. — Vampyrops dorsalis Thomas, V. fumosus Mil- 

 ler, V. helleri Peters, V. lineatus (Geoffroy), V. recifinus Thomas, 

 V. umbratus Lyon, V. vittatus Peters, V . sarhinus H. Allen. 



