14 Mr. G. Lewis on 



to the angle, inner stria deeper and reaching the base and 

 anteriorly it terminates behind the outer stria and is similarly 

 hamate ; the elytra, striae, inner subliumeral interrupted in 

 the middle and shortened a little at the base, 1-3 complete, 

 4 shortened at the base, 5-6 approximately dimidiate ; the 

 propygidium is densely punctate laterally, punctures in the 

 median area less close ; the pygidium is wholly and densely 

 punctate ; the prosternum, keel narrow, base spatulate, apical 

 stria oblique, only marginal at the tip ; the raesosternum is 

 deeply emarginate, stria interrupted in the middle (this 

 stria is interrupted in all the closely allied species). The 

 anterior tibias are 3-dentate, apical tooth very large, inter- 

 mediate and posterior tibife multispinose. 



Above, this species is very similar to //. rohusticeps, Mars. ; 

 but H. robusticepSj Mars., and H.fortis, Sch., differ from the 

 species of the robustus group generally in having the anterior 

 lobe of the prosternum marginate. In H. robustus, Er., and 

 the species closely similar to it the prosternum is marginate 

 only at the tip, as the stria laterally takes an oblique direc- 

 tion, and in doing so departs from the anterior edge. 



IJab. Tschinde, mouth of the Zambesi E-iver. 



Ht'ster colonicus, sp. n. 



Lalo ovatus, parum depressus, niger, nitidus ; stria frontali integra 

 ad oculos angulata ; pronoto stnis duabus latcralibus validis in- 

 tegris ; elytriis striis 1-3 integris, 4 basi evanesceuti, 5 apicali, 

 sutiirali basi abbreviata ; propygidio dense punctato, interstitiis 

 longitudinaliter elevatis ; mesosteriio sinuato, marginato ; tibiis 

 anticis fortiter tridentatis. 



L. 7-7$ mill. 



Broadly oval, rather depressed, black, shining ; the head, 

 frontal stria complete and feebly sinuous in front, angulate 

 over the eyes, mandibles broad and bidentate ; the thorax 

 transverse, bistriate laterally, striaj deep and complete, with 

 the interstice and border convex, external hamate behind 

 the anterior angle, which is somewhat obtuse, the marginal 

 stria is fine and limited to the region of anterior angle, the 

 inner is broken behind the eye but continued behind the neck, 

 there is a very small linear scutelhir puncture; the elytra, 

 stria?, outer humoral wanting, inner deep and shortened well 

 before the base, with a fine ohlique appendage on the shoulder, 

 1-3 strong and complete, 4 fine and evanescent (or sometimes 

 broken) at the base, 5 apical, dimidiate, sometimes broken, 

 somefimes twisted, sutural shortened before the base aiul 

 avcuate ; the propygidium is densely and coarsely punctate. 



