286 Transactions South African Philosophical Society, [vol. xiii. 



labial palpi swollen, briefly fusiform, very little acuminate at the tip, 

 a little longer than the preceding joint ; maxillae very robust, deeply 

 hollowed inwardly, armed on the upper margin with two strongly 

 bifid teeth and having two more beneath these, these teeth, however, 

 are extremely sharp, but they are also occasionally entirely blunted ; 

 last joint of the moderately long maxillary palpi fusiform, not 

 sharply acuminate, plainly but briefly setulose and not impressed ; 

 mandibles very robust, arcuate, deeply hollowed on the outer face 

 and sharply edged round the hollow ; labrum vertical, deeply cleft ; 

 head small, wider, however, than the clypeus, and separated from it 

 by a very plain transverse suture, frontal part with a transverse, 

 almost keeled elevation on the vertex, clypeus transverse with 

 the anterior margin renexed and the angles moderately rounded, 

 eyes divided in the anterior part by a hairy canthus ; antennae 

 10- jointed, the three last joints forming an elongato-ovate club 

 shorter than the pedicel, and only slightly more elongated in the male 

 than in the female, the fifth, sixth and seventh joints are angular on 

 the inner side ; prothorax short, convex, plainly hairy along the 

 anterior margin, more attenuate laterally in the anterior than in the 

 posterior part, and with the basal angles sharp ; scutellum ogival, 

 sharp at apex ; elytra as wide at the humeral part as the base of the 

 prothorax, but occasionally a little wider, and plainly ampliate 

 laterally from about the median to the posterior parts, somewhat 

 convex behind, moderately retuse there and not covering completely 

 the propygidium which is deeply and conspicuously grooved longitu- 

 dinally in the centre in the same manner as, although more con- 

 spicuously than in Psilonychus ; pygidium vertical, slightly longer 

 than broad, plane ; abdomen very swollen in both sexes, strongly 

 bulging laterally beyond the elytra in the male, not in the female ; 

 segments fused ; hind tibiae with one rudimentary oblique keel ; 

 anterior tibiae tri-dentate, and with a long inner spur ; tarsi short,, 

 claws long, curved and with a nearly median vertical tooth. 



This genus is represented in British East Africa by one species 

 which occurs also in Natal. The other South iVfrican species is 

 so extremely variable that it has been several times described under 

 different names. The two have each three short longitudinal 

 denuded bands set past the median part of each elytron. 



Key to the Species. 

 Teeth of maxillae very sharp, scutellum closely punctate . . . . sub-fasciatus. 

 Teeth of maxillte blunt, scutellum impunctate crassus. 



