238 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
Genus TOMOPEAS Miller. 
1900. Tomopeas Miller, Ann. and Mag. Nat. Hist, 7th ser., VI, p. 570, 
December, 1900. 
Type-species. — T omopeas ravus Miller. 
Geographic distribution.— Peru. 
Number of forms. — Only the type species is thus far known. 
Characters . — Dental formula: 
- 2 -. 1 . 4 5 6 7 .1-1 ^1-1 , 1-1 
i 2-. 1. - 2 - 4 5 6 X 1 2-2’ °1 - V P ‘ >1 2-2’ 
111 
3-3 
3-3 
=28. 
Upper incisor close to canine though not actually in contact its 
shaft subterete, nearly half as high as that of canine, strongly 
curved backward at extremity, the posterior surface slightly concave ; 
cingulum forming a small but distinct inner basal cusp. Lower 
incisors subequal, trifid, slightly imbricated. Canines well devel- 
oped, but showing no special peculiarities in form; shaft of upper 
canine slightly curved backward; cingulum of lower canine forming 
distinct anterior basal lobe. Upper premolar {pm 4 ) relatively large, 
its crown area more than three-fourths that of first molar, very 
slightly emarginate posteriorly, its inner cusp well developed. Lower 
premolars slender, not peculiar in form. Molars normal ; m 1 and m 2 
with large protocone, the commissure of which joins the very dis- 
tinct hypocone; inner border of tooth with noticeable concavity just 
in front of hypocone ; m 3 about as large as premolar, its metacone 
and three commissures well developed. Lower molars with all the 
cusps present, their development normal, except that the paraconid 
is unusually low. Skull with smoothly rounded, somewhat flat- 
tened braincase, the occipital depth about two-thirds breadth above 
posterior roots of zygomata. Rostrum considerably more than half 
as long as braincase, flattened above, with distinct median groove and 
a shallow though noticeable longitudinal concavity on each side. No 
sagittal crest, but edges of orbits distinctly ridged. Outline of nares 
forming rather more than half of a circle when viewed from above. 
Palate slightly concave longitudinally, distinctly concave laterally, 
its anterior emargination shallow, with distinct median projection, 
its posterior prolongation scarcely extending beyond molars. Ptery- 
goids parallel, inclosing a nearly square space; hamulars minute, 
slightly bent inward. Audital bullse large, their diameter noticeably 
exceeding space between them, but greatly emarginated on inner 
side and so flattened that they are almost discoid, the edge curving 
over postero-internally, but not elsewhere. No basisphenoid pits, 
Externally not unlike a small Pipistrellus , but upper lips very 
widely spreading, ear with no anterior basal lobe, but with a rudi- 
mentary keel ; tragus short and blunt ; antitragus small but distinct. 
