440 Transactions South African Philosophical Society, [vol. xii. 



by the pale coating, but in the female there is a transverse series of 

 deep punctures along the anterior margin, as well as a few scattered 

 ones on the discoidal part, and the walls of the median groove are 

 also finely aciculate ; elytra elongate, slightly sinuate laterally near 

 the shoulder where they are a little narrower than the prothorax, 

 sub-parallel for the greatest part of the length, conspicuously attenuate 

 behind, and singly aculeate at apex, the suture is conspicuously 

 raised, and there is on each side four sharp, highly raised ridges, the 

 first and fourth of which reach to the apex, while the second is a little 

 shorter, and the fourth disappears at a short distance from the base, 

 intervals plane and without visible traces of punctuation ; under side 

 and legs not visibly punctate ; anterior tibiae tri-dentate in the male, 

 the two apical teeth being united at base, and the basal one well 

 developed; in the female the basal tooth has disappeared and the two 

 apical ones are also united at base ; in the male the intermediate and 

 posterior tibiae are more swollen inwardly at middle, the outer spur 

 of the intermediate tibiae is obliterated, and the inner one is strong 

 and haraate. 



Length 7-11 mm. ; width 3J-1|- mm. 



Hah. Southern Ehodesia (Umfuli Eiver). 



Sybax impeessicollis, Bohem., 



Insect. Caffrar., ii., p. 367, pi. i., fig. D, 6. 



Hypoplatys helophoroides, Har., Berl. Ent. Zeitschr., 1859, p. 221, 

 pi. v., fig. 3. 



A little smaller than small examples of S. sulcicollis; this species, 

 of which the female only is known, differs from that of S. sulcicollis 

 in having the clypeus much less deeply emarginate, two fainter 

 impressions on the head, and a transverse, not tuberculate groove on 

 the vertex ; the shape of the prothorax is identical, but the longi- 

 tudinal groove is very shallow with the walls hardly raised, and has 

 a series of punctures in the centre, the lateral margin is not so 

 deeply impressed, the median oblique impression on each side of the 

 disk is replaced by a short, oblique row of punctures, the elytra have 

 the same shape, but instead of having four sharp ridges on each side, 

 there are two dorsal ones distinct, but not so sharp or so much raised 

 as in S. sulcicollis, and a very faint supra-lateral one which is hardly 

 discernible past the median part, the intervals are plane, but 

 through the yellowish white coating one can see a row of punctures 

 on each side of the costae, and the costaB themselves are minutely 

 pubescent ; in the only example at my disposal, one of Boheman's 



