THE FAMILIES AND GENERA OF BATS. 
259 
Genus PROMOPS Gervais. 
1855. Promops Gervais Exped. du Comte de Castelnau, Zool. Mamm., p. 58. 
1878. Promops Dobson, Catal. Chiropt. Brit. Mus., p. 407 (part). Subgenus 
of Molossus. 
Type- species.- — Promops ursinus Gervais —Molossus nasutus Spix. 
Geographic distribution . — Warmer parts of America, north to 
southern Mexico. 
Number of forms. — This genus as now restricted contains only the 
type species and Promops fosteri (Thomas). 
Characters . — Dentition as in Eumops , except that the upper inci- 
sors are not as high (barely 
one-half height of canine) , the 
anterior upper premolar is re- 
duced to a mere structureless, 
often deciduous, spicule, the 
lower premolars are greatly 
crowded, their width notice- 
ably exceeding their length, 
and the upper molars lack all 
distinct trace of hypocones. 
Skull (fig. 48) differing con- 
spicuously from that of Eu- 
mops in its general shorter, 
broader, and more rounded 
outline, the presence of a high 
sagittal crest extending for- 
ward almost to level of lach- 
rymal region, the very marked 
shortening and deepening of 
the rostrum (horizontal dis- 
tance from orbit to nares 
scarcely half depth through 
lachrymal region) , the slightly 
emarginate audital bullae (as in Molossus and Eumops ), and the 
highly domed palate ( antero-posterior concavity nearly as great as 
lateral). External form heavier and more robust than in Eumops. 
Ears short, rounded, arising from same point on forehead, extending 
barely to nostril when laid forward; keel low and rounded; anti- 
tragus very distinct, constricted at base, its substance noticeably 
thickened posteriorly; tragus minute, very slender though distinctly 
flattened. Muzzle pad very small but rather distinctly outlined, 
though without median ridge or horny processes; a keel-like ridge 
from immediately behind muzzle to point of origin of ears. Lips 
slightly expanded, scarcely wrinkled; spoon hairs small, forming a 
Fig. 48. — Promops fosteri. Adult female. Villa 
Rica, Paraguay. No. 105677. x 2£. 
