THE FAMILIES AND GENERA OF BATS. 
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expansion near anterior base. Basisphenoid pits absent. Audital 
bullae small, covering less than half surface of cocheleae. Sagittal 
crest well developed, not divided anteriorly, but continued forward 
as a line traceable to posterior extremity’ of nasals. Noseleaf well 
developed. Ears large, separate or joined across forehead. Tail 
shorter than femur, extending about to middle of broad interf emoral 
membrane. 
Species examined. — Tonatia bidens (Spix) and T. Venezuelan (Rob- 
inson and Lyon). 
Genus MIMON Gray. 
1847. Mimon Gray, Proc. Zool. Soc. London, p. 14. 
1878. Mimon Dobson, Catal. Chiropt. Brit. Mus., p. 491. 
Type-species. — Phyllostoma bennettii Gray. 
Geographic distribution. — Tropical America, north to southern 
Mexico. 
Number of forms. — -Only the type species is at present recognized. 
Characters. — Dental formula: 
-2 3. 1. --34567.2-2 1-1 2-2 3 - 3_ QA 
1 - 1. - 2 - 4 5 6 7 1 - 1’ 0 1 - V? m 2 - 2’ m 3 - 3 ' ' 
Teeth like those of Tonatia except that the inner upper incisors are 
scarcely oblique and are separated from canines by distinct space 
occupied by well-developed outer incisor, lower canines are not in 
contact, and the rudimentary middle lower premolar has disappeared. 
Lower molars with paraconid slightly more distinct than in Micro- 
nycteris. First upper premolar ( pm 3 ) much larger than outer 
incisor. Lower incisor higher than wide. Skull slender, but with 
rather broadly arched rostrum noticeably different from the almost 
half-terete form of the same region in Tonatia , Otopterus , and Micro- 
nycteris. Zygoma without expansion either in front or behind. 
Basisphenoid pits broad and shallow, separated by a prominent 
median ridge. Audital bullse small, covering about one-half surface 
of cochleae, but unusually narrow, with almost a ridge along ventral 
edge; height of bulla on inner side barely equal to width of basi- 
occipital. Ears large, separate. Tail about as long as femur, ter- 
minating near middle of broad interfemoral membrane. 
Species examined. — Mimon bennettii (Gray). 
Genus ANTHORHINA Lydekker. 
1855. Tylostoma Gervais, Expect du Comte de Castelnau, Amer. Suet, Zoot 
Mamm., p. 49. Not of Sharpe, 1849. 
1878. Tylostoma Dobson, Catal. Chiropt. Brit. Mus., p. 488. 
1891. Anthorhina Lydekker in Flower and Lydekker, Mammals living and 
extinct, p. 674. 
Type-species. — Phyllostoma cremdatum Geoffroy. 
Geographic distribution. — Tropical South America, 
25733— No. 57—07 m 9 - . 
