154 BULLETIN" 57, UNITED STATES NATIONAL MUSEUM. 



appears to be the most primitive of the Stenodermines, a position in- 

 dicated by the slightly modified form of the skull, and more espe- 

 cially by the large size and nearly complete condition of the posterior 

 molar in both jaws. By Harrison Allen it was associated with Phyl- 

 lonycteris a,s a section of the Glossophaginas, while by Dobson it was 

 regarded as a relative of the Desmodonts. 



Genus URODERMA Peters. 



1865. Uroderma Peters, Monatsber. k. preuss. Akad. Wissensch., Berlin, p. 



587 (genus). 

 1878. Uroderma Dobson, Catal. Chiropt. Brit. Mus., p. 515 (subgenus of 



Artibeus, part). 

 1901. Uroderma Rehn, Proc. Acad. Nat Set. Philadelphia, 1900, p. 757. 



February 9, 1901 (genus). 



Type-species. — Uroderma bilobatum Peters. 



Geographic distribution. — Tropical America north to Panama. 



Number of forms. — Two species of Uroderma are now known, U. 

 bilobatum Peters and U. convexum Lyon. The species planirostris, 

 an Artibeus, has been wrongly placed in this group on account of its 

 tooth formula. 



Characters. — Differing from Artibeus (p. 160) in the longer, much 

 deeper rostrum, the well-developed last molar, both above and below, 

 the bilobed outer upper incisor and in certain other details of tooth 

 structure. Dental formula: 



- 2 3. 1. - - 3 4 5 6 7 .2-2 1-1 2—2 3-3_ QO 



12-. 1.-2-4 5 6 7*2-2' C l-r^ W 2-2' m 3-3~ dA 



Relative size and general form of incisors as in Artibeus, but * 3 with 

 cutting edge distinctly and equally bilobed. Premolars and molars 

 (Plate VI, fig. 1) as in Artibeus, except that the surface sculpture on 

 molars is much coarser and less extensive, tending in m 1 and m 2 to 

 form a rudimentary metaconule, m ± lacks the metaconid, and m * 

 and m , are well developed, though small teeth, the former broader 

 than long and with about one-fourth the crown area of to 2 , the lat- 

 ter subquadrate, with nearly half the crown area of to 2 . Rostrum 

 fully three-fourths as long as and more than half as deep as brain 

 case, giving the skull a very different aspect from that of Artibeus. 

 Length of rostrum much greater than lachrymal breadth and about 

 equal to distance across palate, including first molars. Depth through 

 lachrymal region nearly equal to lachrymal breadth and more than 

 half depth of brain case. 



Species examined. — Uroderma bilobatum Peters and U. convexum 

 Lyon. 



Remarks. — As first clearly pointed out by Rehn this genus differs 

 conspicuously from Artibeus in the form of the skull. In this charac- 



