1904.] Catalogue of the Coleoptera of South Africa. 41 
Gren. TROCHALUS, Cast., 
Mag. Zool., Col. ix., 1832, pl. 44. 
Mentum elongate, cordiform from the constricted lateral part to: 
the very narrow base, convex, and hairy, fused with the depressed 
ligular part the outer angles of which are rounded and the anterior 
part emarginate, labial palpi short; maxillze robust, straight, provided 
inwardly with three or four sharp teeth, last joint of labial palpi 
sub-cylindrical ; clypeus longer than the frontal part, mostly always 
very strongly narrowed laterally in the anterior, the constriction 
being edged by the strongly reflexed lateral margin which is strongly 
sinuate and often aculeate below the gene. This margin is either 
normal, 7.¢., it is continued as the edge of the outer anterior angles 
(LT. ferrugineus) or disappears before reaching the very strongly 
reflexed anterior part (Z’. modestus), or again is produced diagonally 
across the anterior part and reaches there the anterior margin either 
in the centre (7. damarus) or at a short distance from it (7. badius) ; 
whenever this upper lateral margin is diagonal, the lower margin of 
the clypeus becomes more visible, the anterior margin is always 
strongly reflexed, and either sharply or bluntly tri-dentate, or not 
even aculeate in the centre, and the median tooth is never prolonged 
into a longitudinal keel dividing the not very hollowed anterior part 
into two as in the genus Ablaberoides, but many species have a 
longitudinal median keel, sometimes even very conspicuous, which, 
however, does not reach either the base of the median anterior tooth, 
or the sharp transverse carina which divides the clypeus from the 
frontal part; the latter bears in some species (Z’. chloris, T. vagus, 
&c.) a transverse groove sometimes more shallow in the female than 
in the male, equi-distant from the frontal keel and the base and 
running parallel to it; antennz 11-jointed, club 3-jointed, as long as 
or longer in the male than the pedicel; prothorax short, convex, 
ampliated laterally from the anterior to the basal angle; scutellum 
long, sharply acuminate; elytra sub-spherical, ovate or elongato- 
ovate, mostly striate in the dorsal part only; anterior tibia bi- or 
tri-dentate outwardly, the trochanters of the anterior pair broadly 
triangularly dilated, hind femora broad, posterior tibie broadly 
dilated, shorter than the femur, having one distinct and another 
partly obliterated transverse chevron-like ridges, inner margin stiftly 
bristly ; anterior tarsi somewhat short, posterior ones longer, hind 
spurs of the latter longer than the basal joint; claws symmetrically 
cleft underneath ; pygidium slightly convex, hind coxe very slanting. 
and narrow at the base. 
