THE FAMILIES AND GENERA OF BATS. 
247 
skull, with its low, flat braincase and long, deep rostrum, without 
evident lachrymal ridge, and also by the slight zygomatic breadth as 
compared with the total length. Peters gives these measurements as 
13 mm. and 22 mm., respectively, from which it folloAVS that the ratio 
of breadth to length is onty 59 +. In a somewhat immature speci- 
men of E omops wliitleyi a in which the skull has probably not 
attained its full breadth, these measurements are 9.6 and IT, giving 
a ratio of 56 In Molossops cerastes and M. temminckii , on the 
other hand, the ratio of breadth to length is 68 and 69. While it is 
impossible, in the absence of the type specimen, to reach a definite 
conclusion other than that Myopterus is different from Molossops , it 
seems highly probable that Myopterus daubentonii is a large species 
of the same genus as E omops whitleyi , occurring in Senegal, and 
related to wliitleyi much as the large Molossops cerastes is to the 
small M. temminckii. The whitish underparts in the type of Myop- 
terus daubentonii furnish another feature of similarity to the species 
of E omops now known. 
Genus MOLOSSOPS Peters. 
1865. Molossops Peters, Monatsber. k. preuss. Akad. Wissenscb , Berlin, p. 
575 (subgenus of Molossus). 
1869. Myopterus Peters, Monatsber. p. preuss. Akad. Wissensch., Berlin, p. 
402 (not Myopterus _ Geoff roy, 1813). 
1878. Myopterus Dobson, Catal. Ckiropt. Brit. Mus., p. 408 (subgenus of 
Molossus) . 
T ype-species. — Molossus temminckii Burmeister. 
Geographic distribution. — South America. 
Number of forms. — Four species of Molossops are now known. 
Characters. — Dental formula : 
- 2 -. 1. 4 5 6 T .1-1 .1-1 
1 (2)-. 1. - 2 - 4 5 6 7' 1-1 01 2-2’ 
1-1 
1 - 1 ’ 
1-1 .3-8 l 
V m 2 T 2 ’ m 3-3 = 26 or 28 ’ 
Upper incisors strongly in contact with each other, but separated from 
canines by narrow spaces; shaft slender, strongly hooked forward, 
the anterior face evenly convex, the posterior slightly concave; pos- 
terior basal expansion slight. Middle lower incisors crowded for- 
ward from tooth row, their height much less than that of cingulum of 
canine; crown narrow, with no posterior expansion, its anterior face 
slightly higher than long, its cutting edge deeply bifid, the lobes 
nearly equal; outer incisor when present smaller than inner, very 
strongly crowded against canine, the faintly trifid crown a little bent 
inward. Canines strong, simple, with small but distinct cingula and 
no secondary cusps except that formed by cingulum of lower tooth 
anteriorly ; upper canine with broad groove on front surface of shaft ; 
a Male, Cat. No. 141532, U.S.N.M., Lower Niger, Africa. 
