Mr. R. F. Tomes on a neiv Bat. 471 



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 Length of the fourth finger 2 6^ 



of the thumh 4 



of the tibia 9i 



of the foot and claws 7 



of the OS calcis, about 6 



Expanse of wings 13 4 



Length of the nose-leaf, taken behind 9^ 



Total length of the skull, from front of nasal bones 8| 



Breadth across the orbits 5 



Length from the point of the middle upper incisor 



to the posterior edge of the last molar 4 



Length of the lower jaw 6 



Hab. The bottle from which this specimen was taken contained 

 several West Indian species, in which the Monnops Blainvillii and 

 the Chilonycteris gymnonota of Wagner were conspicuous. The 

 latter is distinguished from other species of the genus by having the 

 wing-membranes springing from the middle of the back, instead of the 

 sides of the body ; and there can be but little doubt that it is the 

 Pteronotus Davyi of Dr. Gray. Of course Dr. Gray's specific name 

 will take precedence of that given much later by M. Wagner, and 

 the name of Pteronotus may be conveniently used to distinguish the 

 species as a subgenus of Chilonycteris. It is probable that the spe- 

 cimen from which I have taken the foregoing description may have 

 been received from the same locality as the Mormops and Pteronotus. 

 Obs. — Since the above was written, I have made a careful compa- 

 rison of the skull of this singular Bat with that of several other 

 species hitherto doubtfully placed with the Phyllostomidse. The 

 following are the results : — The genus Schizostoma, which is rather 

 intimately allied to Vampyrus, bears also considerable resemblance 

 to the genus Macrotis iia the general conformation of the cranium 

 and the lower jaw, and also in the very great similarity in the den- 

 tition. The form and size of the ears, too, in these genera are very 

 similar. Macrotis, again, bears in several particulars an intimate 

 relationship to the present genus Lonchorhina. More especially 

 may be mentioned the length of the tail, which extends in both ge- 

 nera to the whole length of the interfemoral membrane, as in the 

 genus Vespertilio, the considerable development of the ears, the size 

 and freedom of the feet, and, perhaps more than all, the general 

 contour of the cranium. 



Pursuing the comparison, we find that Lonchorhina bears very 

 considerable resemblance to Chilonycteris in the form of the anterior 

 part of the cranium, in the number and relative size of the teeth of 

 both jaws, and in the form of the lower jaw. Passing on from Chi- 

 lonycteris to Mormops, the skull of the latter is seen to be an exag- 

 geration of the former, having the facial part still more depressed, 

 and the cerebral part still more elevated. The upper teeth in both 

 these genera are very similar ; and those of the lower jaw do not 

 present any essential differences, the chief one being that in Chilo- 

 nycteris the middle premolar is very much smaller than the corre- 

 sponding one in Mormops, which, although smaller than those on 



