1897.] of the Colcoptera of South Africa. 17 



in group five are three species with cyhndrical antennal club, but 

 there is a Httle difference between Curtisi and cylindricornis , but 

 they agree in having the second joint broader at tip than the third, 

 and truncate, while the sixth group includes all species with bipar- 

 tite prothorax, the anterior part of which is ridged, lenticular, or in 

 the shape of a broadly truncate one. 



This arrangement is, however, somewhat artificial, but in order to 

 make the identification easier I have adopted another one which is 

 more artificial still, but which, I hope, will facilitate the identification. 



Synopsis of Species. 



I. 



Head with a conical spine ou vertex. 



a. 



Club of antennae more or less ovate, but always sinuate in the 

 posterior margin, thickened in the centre, and a little longer 

 than broad. 



b. 

 Prothorax impressed transversely and constricted laterally in 

 the centre, but with the anterior part not much more raised than 

 the posterior. 



c. 



Posterior tibite compressed but slender, femora moderately 

 clavate. 



Club of antennae very thiclv, hardly marginate behind, and 

 with four longitudinal, shallow strias on the upper part of the 

 outer declivity ; prothorax quadrate, divided in two parts of 

 nearly equal size by a deej), transverse impression Jiumholdti. 



Club much thickened in the posterior part, bisinuate out- 

 wardly and having four longitudinal striae on the upper and 

 under parts of the outer declivity and indenting the edges of the 

 outer margin, which is slightly scooped ; prothorax rounded 

 laterally, constricted behind and deeply impressed in the middle damarinns. 



Club subelongate, not very thick and of nearly equal thick- 

 ness, anterior margin nearly straight inimxis. 



Club subelongate, with five deep strise on the outer declivity, 

 outer margin deeply grooved, both edges with five impressions . . dolirni. 



Club subelongate, acutely marginate all round and having on 

 both sides of the outer declivity four longitudinal strise not 

 indenting the outer margin ; prothorax with the anterior angles 

 rounded, the sides nearly straight, and with a deep median 

 cavity spinicoxis. 



Club subelongate, not much convex, sharply carinate all round 

 and without any striation in the outer declivity ; median part of 

 prothorax deeply impressed projnnquus. 



Club lenticular, carinate all round, outer margin with three 

 very small indentations in the middle ; prothorax with a shallow 

 median impression, and very deeply constricted laterally . . . . rusticus. 



2 



