550 Transactions South African PMlosoi^hical Society. ' [vol. xii, 



narrow, obliquely rounded ; prothorax attenuate laterally in front for 

 a short distance only, convex, and having in both sexes a shallow, 

 very oblique depression reaching from the anterior margin to the 

 median part, edged all round by a smooth convex ridge more or less 

 rounded, and having in the posterior margin a triangular tubercle 

 which is sometimes slightly bifid, this shallow depression is roughly 

 and irregularly plicate, and the sides, as well as a moderately broad 

 band in the posterior part of the disk, are scrobiculate, but along 

 the base there is a broad smooth band with a few remote, slight 

 punctures ; scutellum roughly punctured, but having a smooth 

 margin ; elytra very little sinuated laterally and covered with very 

 close, deep cicatricose punctures, the four duplicated dorsal striae 

 are moderately distinct ; stridulating striae in the median part of 

 the propygidium extremely fine, almost indistinct ; under side as 

 in 0. boas, but with the abdominal segments more punctured; 

 anterior tibiae strongly tri-dentate outwardly and with a smaller 

 tooth between the basal and second one, and another above the 

 digitation. 



Length 37-47 mm. ; width 16-20 mm. 



Hab. Cape Colony (? Knysna), Natal (Durban), Mozambique 

 (Louren90-Marquez). It occurs also in Western and Central 

 Africa. 



Gen. AECHON, Kirby, 



Trans. Linn. Soc, xiv., 1840, p. 567. 



Aiigosoma, Burm. 



Mentum elongato-ovate, strongly constricted at the insertion of 

 the palpi which are set near the apex, slightly dilated above the 

 palpi and emarginate at tip, it is nearly plane, broadly but not 

 deeply grooved longitudinally in the middle, and with the ligular 

 part not very oblique ; labial palpi short, last joint cylindrical,, 

 rounded at tip ; apical lobe of maxillae horny and produced into a 

 broad arcuate, excavate tooth briefly bifid at apex and at base, and 

 very much of the same shape as in Pseudocyphonistes ; apical joint of 

 maxillary palpi not long and sub-cylindrical ; mandibles bi-dentate, 

 the inner tooth small and not very apparent, outer one strongly 

 refiexed, but rounded ; clypeus narrowed diagonally laterally and pro- 

 duced at apex into two recurved teeth ; genae narrow, very diagonal ; 

 head bearing in the centre either a gigantic compressed tooth, slanting 

 forward, or a very short one arcuate in the male, but bi-tuber- 

 culate in the female ; prothorax marginate all round, retuse in front 



