302 Mr. G . Lewis on 



Ctlistosoma, gen. no v. 



Body elongate, cylindiical; head retractile, -with a frontal 

 Btria; thorax, antennal fossettes widely open below; elytra 

 striate, strijB sometimes complete; prosternum compressed, 

 striate in the typical species, rounded off at the base and 

 received into the mesosternum ; mesosternum emarginate or 

 Avidely sinuous anteriorly ; anterior tibiai dentate on the outer 

 edge. 



I consider Platjjsoma Itichteri, Sch., the type of Ci/Us(o- 

 soma, and closely similar to it are other species from Mada- 

 gascar, viz. Plutysoma {Teretnus) Fairmaireiy Th^ry, obli- 

 quiim, Lew,, 2?u/y/'Ha;M»2, Sch., quodricolle, Lew., and in all 

 of these the prosternal keel is distinctly striate. In the 

 Catalogue I have associated all the cylindrical Plttysomce 

 temporarily with the above, because the genus Platysoina as 

 it has hitherto stood cannot be conveniently studied without 

 division. 



Ilololepta tniUaj sp. n. 



Elongata, parallela, depressa, nigra, nitida ; fronte baud striata ; 

 elytris, striis 2 dorsalibus brevissimis, 1" appcndiculata ; pro- 

 pygidio sulco arcuatim integro, utriuque foveolato ; pygidio 

 impunctato. 



L. 7^ luilL (absque mandibulis). 



This species is extremely similar to //. paropsi's, Lew., 

 hut it is more parallel laterally ; the male has no thoracic 

 foss£e, the arched sulcus on the pygidium is somewhat angu- 

 late in the middle (not formed as a Moorish arch, as in 

 B . paropsis) , and posteriorly on the inner edges of the sulci 

 are shallow but well-marked foveee, one on each side. There 

 is no trace of a carina on the mentum in the male. 



Hub. Lake Tanganyika, Central Africa. 



Lioderma acutipectiun, sp. n. 



Oblougum, subcouvesum, nigrum, nitidum ; fronte baud striata ; 

 elytris, striis, 1 brevi, 2 Integra, 3 brevissima ; propygidio circum 

 parce punctate ; pygidio dense punctato ; prosterno ante coxas 

 angustato. 



L. 12 mill, (absque mandibulis). 



Oblong, somewhat convex, black and shining ; the head 

 is nearly flat on its vertex and is without stria3, and the 

 mentum of the male is not carinate ; the thorax, the marginal 

 striae terminate near the eyes and the male has no fossettes, 

 behind the anterior angles a few vague punctures are visible ; 



