On a new Bat from Peru. 139 



canines, its lieavy molars, its short smootli-eclged interorbital 

 space, and widely expanded zygomata. 



Mr. Hall is to be congratulated on the very interesting 

 discovery lie has made, and I have much pleasure in counect- 

 iiig his name with the species. , 



XII. — A new Bat of the Oenus Promops /ro?H Peru. 

 By Oldfield Thomas. 



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



The British Museum owes to Mr. J. F. Davison, the donor 

 and collector of several interesting European voles described 

 by Mr. Gerrit Miller, two bats of the genus Promops re- 

 cently captured by him at Chosica, Penn. They belong to 

 the genus Promojys, of which I gave a short classification in 

 1915*, but are not assignable to any species there recognized. 

 The new form may be called — 



Promops davisom, sp. n. 



Size intermediate between P. occultus and P.fosteri, both 

 of Paraguay. Colour dark chocolate-brown, with lighter 

 bases to the hairs, very much as in P.fosteri. Wings as 

 long as in P. occultus. 



ykull smaller than that of P. occultus, of about the same 

 proportions ; larger than that of P. fosteri^ the brain-cuse 

 not so unusually swollen as in that species. 



Foiearm of type 51*5 mm.; third metacarpal 55 mm. 



Skull : greatest length 19*2 ; condyle to front of canine 

 17*6; maxillary tooth-row 7*4 ; m^ and m' on outer edge 3"8. 



Hah. Department of Lima, Peru. Type from Chosica, 

 2700'. 



Type. Adult male. B.M. no. 21. 5. 21. 1. Original number 

 207. Collected 3rd March, 1921, and presented by J. F. 

 Davison, Esq. Two specimens. * 



The species of Promops being mainly determinable by tlie 

 dimensions of their skulls and teeth, this new species may be 

 readily distinguished by the measurements above given. No 

 member of the genus as now restricted has been previously 

 recorded from Pern. 



* Ann. & Mag. Nat. Hist. (8) xvi. p. 61. 



