THE FAMILIES AND GENERA OP 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 follows that the ratio 

 of breadth to length is only 59 -f. In a somewhat immature speci- 

 men of Eomops -whitleyi* in which the skull has probably not 

 attained its full breadth, these measurements are 9.0 and 17, giving 

 a ratio of 56 -+-. In Molossops cerastes and M. temminckii, on the 

 other hand, the ratio of breadth to length is 08 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 Eomops whitleyi, occurring in Senegal, and 

 related to whitleyi much as the large Molossops cerastes is to the 

 small M. temminrk/j. The whitish underparts in the type of Myop- 

 terus daubentonii furnish another feature of similarity to the species 

 of Eomops 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. Wissenseh., Berlin, p. 



402 (not Myopterus Geoffroy, 1813). 

 1878. Myopterus Dobson, Catal. Chiropt. Brit. Mus., p. 408 (subgenus of 



Molossus). 



Type-species. — Molossus temminckii Burmeister. 

 Geographic distribution. — South America. 



Number of forms. — Four species of Molossops are now known. 

 Characters. — Dental formula : 



- 2 -.1. 456 7.1-1 1-1 1-1 1-1 3-3 nn n 



1.(2)- 1.-2-45 6 7 ' 1^1 or 2^2' ° l=V pm 2^2' 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 ; 



« Male, Cat. No. 141532, U.S.N.M., Lower Niger, Africa. 



