THE FAMILIES AND GENERA OF BATS. 
245 
lating two small palatal foramina, or filling the entire space occupied 
in Nyctinomus by the palatal emargination. When this closing of the 
emargination is complete a slight anterior median notch is sometimes 
developed, but this never extends behind incisors. Teeth similar to 
those of Nyctinomus / m 1 and m 2 with well-developed hypocone. 
Species examined. — Chcerephon angolensis (Peters), C. emini (de 
Winton), C. gambianus (de Winton), C. liindei Thomas, C. jobensis 
(Miller), C. johorensis (Dobson), C. limbatus (Peters), C. major 
(Trouessart) , C. plicatus (Buchannan), C. pumilus (Cretzschmar) , 
C. pusillus (Miller). 
Remarks . — This genus, though so closely resembling Nyctinomus as 
to be indistinguishable except by the structure of the palate, is well 
characterized by the complete condition of the premaxillaries. It 
includes all the species without obvious palatal emargination, cur- 
rently referred to Nyctinomus , and is evidently a natural genus. The 
character on which it is now based is wholly unrelated to that which 
Dobson originally assigned to the group. 
Genus EOMOPS Thomas. 
1813. ? My opt er us Geoffroy, Descr. de l’Egypte, II, p. 113. 
1905. Eomops Thomas, Ann. and Mag. Nat. Hist., 7th ser., XVI, p. 574. 
November, 1905. 
Type-species. — M ormopterus whitley i Scharff. 
Geographic distribution. — West Central Africa. 
Number of forms. — Only the tj^pe species is known. 
Characters . — Dental formula : 
- 2 -. 1 . — - 4567 1-1 
1 --. 1 . - 2 - 4567 * 1 - 1 ’ 
c 
1-1 
1 - 1 ’ 
jpm 
1-1 
2 - 2 ’ 
m 
3-3 
3-3 
= 26 . 
Upper incisors strongly in contact with each other and with canines, 
the shafts very slightly curved forward, their anterior face evenly 
convex, their posterior face slightly concave; posterior basal expan- 
sion slight but evident, directed someAvliat outward. Lower incisors 
in contact with each other and with canines, perfectly in toothrow 
though not rising to level of cingulum of canines; anterior face of 
crown slightly higher than long, deeply bifid,- the inner lobe the 
larger ; crowns extended back between canines in a concave posterior 
heel, the general outline of which rather closely resembles the anterior 
face in both size and form. Canines simple, with low but distinct 
cingula, that of the lower teeth forming a slight anterior cusp ; lower 
canines separated by space equal to about one-fourth diameter of 
crown; anterior face of upper canines with barely indicated longi- 
tudinal groove. Upper premolar large, its crown area nearly three- 
fourths that of first molar, its antero-internal cusp small but distinct. 
Lower premolars closely crowded, the anterior smaller but with rela- 
tively more robust cusp than posterior, both teeth somewhat crescen- 
