286 Transactions South African Philosophical Society. [vou x11. 
labial palpi swollen, briefly fusiform, very little acuminate at the tip, 
a little longer than the preceding joint; maxille 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 reflexed and the angles moderately rounded, 
eyes divided in the anterior part by a hairy canthus; antenne 
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 tibiz with one rudimentary oblique keel ; 
anterior tibize 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 African 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 maxille very sharp, scutellum closely punctate.. .. swb-fasciatus. 
Teeth of maxille blunt, seutellum impunctate ..  .. .. .. crassus. 
