698 Transactions South African Philosophical Society, [vol. xii. 



A". Clypeus parabolic. 



Body elongate, elytra very little sinuate laterally, claws of the 



intermediate legs simple underneath in the male Diaplocheluf. 



Body not elongate, elytra strongly sinuate laterally, claw of 

 the intermediate legs with a robust sub-lateral tooth in the 

 male Bizauus. 



Gen. DICHELUS, Serv., 



Encyclop. M^th., x., 1825, p. 373. 



Gu6r., Iconogr. d. Eegn. Anim. Insect., pi. xxv., figs. 8, 8a, 8b. 



Mentum elongate, a little ampliated laterally at a short distance 

 from the base, or occasionally towards the median part, not deeply 

 constricted towards the apex, but more or less deeply emarginated 

 there at the point of insertion of the labial palpi, apical part trans- 

 verse with the angles sharp and penicillate, but occasionally only 

 with a few hairs ; upper lobe of maxillae strongly dentate inwardly 

 and penicillate or not at the tip, the number of the sharp hooked 

 teeth is five {D. villosus) or four, ])ut with the basal one bifid 

 {(leiitipes), or three {laticoUis, &c.) ; last joint of labial and maxillary 

 palpi more or less strongly fusiform and truncate at the tip ; clypeus 

 sub-parallel, truncate, and straight at apex, l)ut with the angles 

 sharply dentate and reflexed, and with two smaller teeth in the 

 middle ; the clypeus is separated from the head by an impressed, 

 transverse line, and is angular laterally at the base ; antennae nine- 

 jointed, club nearly as long as all the four preceding joints taken 

 together ; prothorax attenuate sub-obliquely laterally from the 

 median to the apical part, not very convex, sulcate in the middle 

 only towards the basal part ; scutellum sub-ogival, rounded at tip ; 

 elytra ampliate laterally at the humeral part, more or less deeply 

 sinuate laterally, distinctly narrowed from below the humeral part 

 towards the apex where they leave the greatest part of the pro- 

 pygidium exposed, as well as the edge of the dorsal part of the 

 abdominal segments ; pygidium declivous and sloping forward in 

 the male, sub-horizontal in the female, abdomen strongly com- 

 pressed laterally in the male, but much less so in the female ; 

 metasternum very broad ; hind legs of the male very stx'ongly 

 developed, hind coxae almost transverse, with the hind margin 

 sharply carinate and angular, and when the femora are greatly 

 developed projecting much beyond the abdominal segments ; 

 anterior tibiie with three outer teeth curving slightly downwards, 

 nearly connate at the base ; the two basal ones are set at right 



