336 Mr. G. J. Arrow on a Contribution to the 



elongate, with a distinct, bilobed, strongly cliitinised ligula. Pro- 

 thorax entirely simple. Prosterniuu forming a very prominent 

 finger-like process behind the front coxae. Propygidium without 

 stridulating apparatus. Front tibiae 3-dentate, the four posterior 

 ones narrow, spinose (not digitate) at the extremity. Basal joint of 

 the tarsi not dilated. 



$ . Clypeus shorter and broader. Front tarsi thickened, with the 

 inner claw broad and minutely cleft. 



Butclori/dcs tristis, sp. n. 



Glaber, niger, nonnunquam Itevissime a3neus, elongato-ovatus, 

 inermis, clypeo lato, antice reflexo, minute sinuato, rugose punctato, 

 fronte fortiter laxe punctato ; prothorace similiter punctato, lateribus 

 leviter arcuatis ; scutello baud acuto, minutissime punctato ; elytris 

 baud grosse, sat lequaliter, annulato-punctatis ; pygidio minute et 

 densissime punctulato ; corpore subtus medio Itevi, metasterni lateri- 

 bus rugosis, abdominis lateribus irregulariter punctatis, transverse 

 ciliatis : 



6 > P3'gi'^^io majore, convexo : 



9 , elytrorum marginibus lateralibus ante medium obtuse an 

 gulatis, superficie postica minute et dense punctulata. 



Long. lG-21 mm. Lat. max. 9-11-5 mm. 



Hah. Sierra Leone ; Portuguese Guinea : Bissao 



(Favarel). 



There are several specimens in the British Museum and 

 M. Rene Oberthiir's collection. 



It is very much like the species of the American genus 

 Dyscinctus, to which it is closely related, and might be 

 regarded as a representative of that genus which has 

 strayed across the Atlantic. The prothorax is rather more 

 closely adapted to the hind-body than is usually the case 

 in Dyscinctiis and its posterior angles are not rounded off. 

 Tlie pygidium also is larger, more convex and less promi- 

 nent. Perhaps the most interesting and peculiar ieature 

 is one found only in the female, in which sex the whole of 

 the posterior part of the elytra is closely and micioscopically 

 punctured. 



Mr. Peringuey has made a genus ( Vcncdus), for Ilctcro- 

 nychus paradooms, Bohem,, supposing his only example 

 to be a male; but both genus and species are redundant, 

 being based upon the female of the curious Xcnodorus 

 Janus, F., which occurs on the Gold Coast, in the Congo, 

 Angola, Natal, etc. 



