^45 Mr. Gviiy' a Natural Arrangement 



Art. XXVII. An Attempt at a division of the Family 

 Vespertilionidae into groups. By John Edward Gray, 

 Esq, F.G.S, 



Several celebrated zoologists have paid considerable attention 

 Xo Bats, and have separated them into many (29) Genera ; but 

 they have not attempted to place these genera into natural groups, 

 or to point out the affinity which exists between each of them : 

 to attempt the former is the object of this paper, the latter being 

 left to a future opportunity. 



Bats, or the Family Vespertilionidce^ may be divided into two 

 sections, the former of which is the typical one, containing two, 

 and the latter, the art'nectant, containing three groups ; these, as 

 they are divisions of a family, may be called subfamilies, and I 

 shall adopt for them the termination which Mr. Vigors has used 

 in his table of Falconidce for similar divisions. 



I. The Bats furnished with leaf "like appendages on their noses. 

 Grinding teeth acutely tubercular, Istiophori, Spix, 



Subfam. 1. Phyllostomina. 



The nose leaf simple, fleshy, solitary or twin; the index finger 

 formed of two phalanges. 



Genera, Phyllostoma, Glossophaga, Rhinopoma, and Vampyrus 

 .of Geoffroy^ Arctibeus, Medateus, and Monophyllus, Leachy 

 Diphylla, and Vampyrus of Sjiix ; as the latter differs from 

 . Geoffroy's genus of that name I propose to call it Istiophonis. 



Subfam. 2. Rhinolophina. 



The nose leaf complicated, membranous; the index finger of 

 only one joint ; the wings large and broad. The females have 

 usually ventral as well as pectoral teats.* 



Genera. Rhinolophus, Megaderma, and perhaps Nycteris, of 

 Geoffroy^ and the genera Nyctophilus and Mormoops of Leach, 



II. Bats destitute of any leaf like appendages on their nose, 

 Anistiophori, Spix. 



♦ I have observed two ventral or rather pubal teats in Megaderma Lyra. 



