24 ZOOLOGY OF THE VOYAGE OF THE SULPHUR. 



Mormoops, Leach. — Nose and chin ornamented with complicated membrana- 

 ceous ridges. Ears large, broad, nearly united. Interfemoral membrane large, 

 truncated. Feet free. 



II. Tail produced beyond the end of the conical produced interfemoral mem- 

 brane. Wings only affixed to a narrow line along the back. 



Pteronotus, Gray.— Ears lateral. Chin with two transverse membranaceous 

 ridges. Feet free. — P. Davyi, Trinidad. 



III. Tail thick, elongate, produced beyond the end of the short transversely 

 folded interfemoral membrane. 



Myoi'teris? Geoff. — Ears separate on the side, large. Muzzle short, blunt. 

 Cuttina; teeth 4. 



Cheiromeles, Horsfielcl. — Ears separate on the sides. Muzzle obliquely 

 truncated. Lips smooth 1 Cutting teeth f. — Java. 



Nyctinomus, Geoff. — Ears large, close together, folded down on the forehead. 

 Muzzle obliquely truncated. Lips large, transversely grooved. 



Molossus, Geoff. — Ears large, close together, folded down on the forehead. 

 Muzzle rounded. Lips swollen, smooth or hairy. 



IV.? Tail none. Interfemoral membrane distinct, deeply cut in. Head rounded. 

 Face distorted by cartilaginous ridges. Wings broad. Perhaps near Phyllos- 

 tomina ? 



Centurio, Gray. 



MOSIA. 



Mosia, Gray, Ann. and Mag. Nat. Hist. 1843. 117. 



Cutting teeth 2 6 ?, the upper far apart, inner large, oblique, the outer very small. Head 

 small, hairy. Forehead flattened, rather concave in front. Lips rather thick, lower 

 with two triangular warts in front. Nose rounded; nostrils apical, roundish, not pro- 

 duced, and without any groove on their hinder edges. Ears moderate, lateral. Tragus 

 elongate, well developed. Wings thin. Thumb small, slender, the first joint very short, 

 webbed. Interfemoral membrane large, truncated. Heel bone rather long. Tail slender, 

 tip produced on the middle of the upper surface of the membrane. Hind feet small, 

 attached to the wing to the base of the outer toes. Toes subequal, slender. 



This genus has all the external appearance of a Vespertilio, but it has the 

 simple nostrils of Noctilionina, and the tail of an Emballonura. It differs from 

 the latter genus in the nose not being produced and truncated, and in the nostrils 

 not being tubular. It appears to be somewhat intermediate between the two 

 tribes of Vespertilionina and Noctilio)iina. 



When I first examined the specimen, I believed there were only two cutting 

 teeth in the upper jaw, but, on re-examination, and pressing down the gums, two 



