266 Generic Classijication of the Tapliozoiis Group. 



Tins is no doubt the form oi M. ursuhts wliicli inliabits tlie 

 forest-ief:;ion to the west of the Tocantins River, while 

 the Parii area to the east of that liver is the locality of the 

 true insuhis. 



IIotYiiiaiinsefrsr was said to liave received his orifjiual 

 ppecimens from near the mouth of the Tocantins, a statement 

 which nii<rht give rise to confusion. But it appears tliat 

 the word Tocantins is equally applied to the broad estuary 

 which runs north-eastwards past Para and the narrower 

 river which runs nortii wards, nearly at right angles to the 

 other, separating the district in which Cameta stands from 

 the true Para region. The latter is the home of iirsidus, the 

 former that of iimhratus. 



XXXII, — The Generic Classification of the Ta\)]iozo\is Group. 

 By Oldfield Thomas. 



(Publiehed by permission of the Trustees of the British Museum.) 



When, in ]015, I wrote my "Notes on J^aphozous and 

 Saccolainnis" '^f and recognized the latter as a distinct genus 

 from the former, as had Hollister previously under another 

 name, I did not sufficiently weigh the characters which 

 separate Taphozous nudiventris and its allies from the typical 

 members of Taphozous. 



On reconsidering the subject, I now tliink that these 

 remarkable half-naked bats should be separated as a distinct 

 genus from the ordinary hairy species, and would suggest 

 that the whole group might be synoptically arranged as 

 follows : — 



A. Biillte imperfect, the inner side of each 

 incomplete. A radio-metacarpal pouch. 



a. Frontul concave ; upper profile of brain- 



case rising fiom it in a strong curve. 

 Occipital "helmet" scai-cely deve- 



lopea. Body haired as usual I. Taphozous, Geoff. 



Genotype : T. perforatum, Geoff. 



b. Frontal almost flat, the cranial profile 



scarcely risinp: above it behind. A 

 strongly developed occipital helmet. 



* J. Bombay Soc. xiiv. p. 67 (1916). 



