380 Mr. G. Lewis on 



criminately placed in Apohhtes and Plafrjf<nmn, wliicli have 

 an almost inipunctate pygidiiim, with two large and deep 

 excavations in the base near the outer edge. With this 

 exception the general characters of these species agree with 

 PJatysoma ; but I think it is now time to separate them, and 

 I ])ropose to adopt Liopygus as a generic name for them. I 

 include in it decemstriatus, Mots., cavatics, Lew., e.vi'r/uum, 

 L,ew.,fameh'cus, Lew., Gestroi, Lew., and diopsipygas^ Mars. 



Pachycrcerus violaceipennisy sp. n. 



Oblon»o-ovatus, niger, elytris subviolaceis ; frontc bistriata, striis 

 lajvissinie impressis ; mesosterno parum acute producto, antice 

 immarginato. 



L. 4 mill. 



Oblong-oval, black, shining, elytra with a violet tinge ; 

 forehead and clypeus widely excavated and sparsely punc- 

 tulate, stria well marked over and in front of the QyQS,^ but 

 after passing the base of the mandibles it splits into two and 

 becomes very fine, the anterior branch taking a semicircular 

 course, and the posterior branch bending in the middle in the 

 reverse direction towards the neck ; thorax punctulate on the 

 disk, punctures at the sides larger and more closely set, ante- 

 rior angles a little deflexed and a little acutely produced, with 

 an impression within the angle, marginal stria complete ; 

 elytra, stri{\3 1-8 complete, fourth sliortened at the base, iifth 

 nearly one third tlie lengtli of the elytron, sutural reacliing, and 

 widening out a littleat, tlic scutellum, and apically theinterstice 

 is slightly narrowed ; propygidium rather closely punctured, 

 punctures on pygidiurn more dense ; prosternum, keel flat, 

 with lateral striae fine and parallel before the coxa?, and widen- 

 ing out a little at the base, surface sparsely j)unctulate ; 

 mesosternum somewhat acutely produced anteriorly, with a 

 tine oblique stria at the sides only ; the stria is common to 

 the metasternum also. The mesosternum and first segment 

 of the abdomen punctulate like the prosteriuim, but the meta- 

 sternum is nearly smooth. 



The frontal stria; are a remarkable characteristic in this 

 insect. 



Hid). Itcmbo, Central Congo {Duvivier). 



Histcr rccnrvuSj Mars. 



This species is a maculate one; it has two large lobe-like 

 red sj)ots at the base of the thiMax, well soparatcil from each 



