470 Transactions South African Philosopliical Society, [vol. xii. 



declivous at some distance from the apex where it is narrower than 

 from the base to past the middle, and very distinctly reflexed at tip. 



Length 12-13 mm. ; width 7-8 mm. 



This species much resembles T. geminatus, Oliv., but the elytra 

 are a little more elongate and appear thus to be more parallel ; the 

 rows on the elytra are also more narrowly costate than in T. gem- 

 matus or T, radula. I have not been able to examine the genital 

 armature of the first-named species. 



Hah. I have so far recorded this species from Damaraland 

 (Ganap.) only. 



Trox (Omorgus) gravidus, n. spec, 

 Plate XXXIX., fig. 17. 



Elytra broadly inflated, the width of the elytra at their broadest 

 part being about equal to four-fifths of the length in large examples ; 

 it resembles T. ponderosus very closely, but is stouter ; the sculpture 

 of the head and prothorax is similar, the clypeus is also slightly emar- 

 ginate at tip, but the rows of tubercles on the elytra are similar to 

 those of T. aspenilatus : that is to say, the four or five dorsal rows are 

 of nearly equal height, very closely set, and the granulose tubercles 

 in the intervals are very distinct and regular, and towards the outer 

 margin nearly as high as those on the alternate rows. Apart from 

 the broader, and therefore less parallel, facies, the shape of the genital 

 armature, although not unlike, is however quite distinct. In the 

 figure given (pi. xxxix., fig. 17) the inner part of the forceps is correctly 

 delineated, but the angle of the incurved part is sharply angular in 

 the lower outer margin. The shape of the armature of T . 'ponderosus 

 is almost similar to that of T. asperulatics, being mostly differentiated 

 by the median raised longitudinal line of the median lobe which is 

 also present in T. gravidus. 



Length 15-17 mm. ; width 9f-12 mm. 



Hah. Damaraland and Ovampoland (no exact locality). 



Trox (Omorgus) foveolatus, Bohem., 

 Ofv. Vet. Ak. Forh., 1860, p. 114. 



In this species the elytra have a more rounded, ampliate appear- 

 ance owing to the more obliquely attenuate shoulders, and except for 

 this it resembles T. gravidus, but the sculpture of the elytra also is 

 not the same ; the head and prothorax are covered with a dense. 



