1900.] Catalogue of the Coleoptera of South Africa. 169 



of an inverted truncate cone, second joint gradually ampliate from 

 the base to the apex, truncate diagonally at tip, third one subulate, 

 implanted nearly on the centre of the second one, and very small, the 

 size of this apical joint varies a good deal, but it is never equal in 

 length to half the width of the truncate part of the second ; maxillary 

 palpi very slightly pubescent, second joint a little shorter than the first 

 which is a little curved, apical one fusiform, blunt at tip ; antennae nine- 

 jointed, club tri-jointed, the two penultimate joints hollowed, the last 

 one smaller than the two previous ones and also hollowed a little 

 outwardly at the tip, this club is not glabrous like the other joints, 

 and is always opaque ; head with a frontal carina, which is, however, 

 often absent, eyes divided, not showing very much on the upper 

 side and carinate above, gena^ generally distinct, either rounded 

 laterally, in a line with the clypeus or auriculate, clypeus semi- 

 circular and more or less deeply emarginate in front with the angles 

 of the emargination more or less recurved, or sub-triangular only in 

 one case (0. pudens) angular laterally so as to form a tooth ; 

 prothorax large, moderately convex, seldom quite plane, rounded 

 laterally, but less ampliate there in the male of many species than in 

 the female, basal angle generally rounded except in some species 

 having two long, decumbent cephalic horns, in which case it is pro- 

 duced in a sharp spine or sharp angle (0. varus, furcife)-, rangifer), 

 basal part of the prothorax either rounded or acuminate in the 

 centre, it is marginate in front and on the sides and occasionally 

 along the base, but always less distinctly there ; no scutellum ; 

 elytra short, very seldom convex, narrowed and rounded behind, 

 suture raised, they have each seven striae, very seldom non- 

 geminate, and the second is often broader than the third, in which 

 case there is a faint trace of an auxiliary stria in the middle of it, 

 there is a sub-humeral callus and in many species the three outer 

 intervals are callose at the apex ; pygidium in the shape of a triangle 

 rounded at apex, always a little convex at middle in both sexes ; 

 metasternum very broad in the middle, always a little convex, 

 occasionally sub-aculeate in the anterior part before the apical 

 transverse impression, carinate laterally, but very seldom in front, 

 where the suture with the mesosternum is but feebly indicated ; legs 

 strong, not long ; anterior tibia? carinate underneath, dilated and 

 truncate at tip, quadri-dentate outwardly and serrulate below the 

 teeth, spinose or angular inwardly in the male and having an apical 

 spur inserted in or near the median part of the truncate part, this 

 spur varies very much in shape and also according to the sex, both of 

 which have tarsi in the fore legs ; posterior legs serrate outwardly 

 and uni-carinate, basal joint of intermediate and posterior tarsi com- 



