468 Transactions South African Pliilosophical Society, [vol. xii. 



there is a row of closely set, sharp tubercles; prosternum transversely 

 nodose ; anterior tibias with three very distinct sharp teeth, the 

 apical one being separated from the second by a deep emargination, 

 two faint serrate teeth near the elbow ; intermediate and posterior 

 tibiae sharply serrate. 



This species is nearly as much inflated in proportion to its size 

 as T. gravidus. It is, however, distinguished by the more raised 

 tubercles, and also by the shape of the genital armature, the outer 

 forceps of which are not emarginate inwardly towards the apex or 

 angular outwardly. 



Length 11-14 mm, ; width 8-10 mm. 



Hab. Mozambique (Maputa Eiver, Louren^o-Marquez). 



This species may pei'haps prove to be identical with T. rusticus, 

 Har., nee Fahroeus. 



Trox (Omorgus) denticulatus, Oliv,, 

 Entom., i., 4, p. 13, pi. ii., fig. 14 a, h. 



Trox asperulatus, Har., ]\Ionogr., p. 75. 



T. rachda, Bohem. nee. Eiichs., Ofvers. Vet. Akad. Forh., 1860, 

 p. 157. 



Varies much in size and development of the tubercles on the 

 elytra. It is elongate, sub-parallel ; the shape and sculpture of the 

 head and prothorax are similar to those of T.ponderosus, but the outer 

 margin of the latter part is more serrate, the coating is identical, but 

 the rows of tubercles on the elytra have a more costate appearance 

 owing to their being more equal, less acuminate, and also more 

 closely set, this, however, is not always the case, in some species 

 the tubercles being a little more developed than in others, but always 

 less than in T. ponderosus ; the prosternum is transversely nodose ; 

 the anterior tibiae are similar, but as often as not the second outer 

 tooth is worn out obliquely ; the shape of the genital armature is 

 only slightly different, the inner edge of the outer branch of the 

 forceps being a little more deeply emarginate past the middle, and 

 the upper lobe having a median longitudinal raised line. 



I can find no difference between T. asperulatiis, Har., and T. 

 denticulatus, Oliv., either in sculpture or in the shape of the male 

 organs ; my examples of the last-named species are from Abyssinia.''' 

 Length 13-18 mm. ; width 8^-11 mm. 



* In the closely allied species, T. desertorum, Har., from Egypt, the forceps 

 are quite similar in shape and curve, but the median upper lobe is much 

 more narrowed, and deeply grooved in the centre with the sides raised and 

 rounded. 



