408 Transactions South African Philosophical Society, [vol. xiii. 



absolutely similar to that of the variety of M. algoensis already men- 

 tioned, the male differs in the shape of the cephalic horns, which, 

 similar to those of M. algoensis from the base to two-thirds of the 

 length, have there the upper carina vertically truncate, and continued 

 as a sub-cylindrical process strongly curved and hamate at apex, 

 and much more raised than the upper angle of the truncate part 

 instead of being triangularly dilated and truncate at tip as in 

 algoensis ; these horns are not as diverging as in the latter, and 

 the median porrect frontal horn is not more developed than in the 

 var. flavipennis. 



I have seen five males, including the type, and two females. The 

 genital clasps of the male are hardly distinguishable from those of 

 M. algoensis, and, in spite of the different shape of the cephalic 

 horns, I am strongly inclined to consider the present species as 

 only a variety of M. algoensis. Intermediate forms will probably 

 be met with, much more so than in the intermediate and small 

 development it is quite plain that the hamate part of the horns is 

 the increase of the inner angle at the expense of the outer, the latter 

 being still noticeable. 



Length 18-22 mm. ; width 10-12 mm. 



Hob. Natal (Tugela Eiver), Transvaal (Barberton). 



Gen. GENYODONTA, Burm., 

 Handb. d. Entom., hi., 1842, p. 234. 



Mentum ampliate, rounded laterally, ligular part slightly dilated 

 in front, narrowly and deeply incised in the centre and with the 

 outer angles conspicuously rounded ; palps cavity moderately long 

 and moderately broad ; inner lobe of maxillae sharply hamate, upper 

 one laminate, arcuate, truncate at apex and concave ; antennal club of 

 nearly equal size in both sexes, and shorter than the pedicel ; head 

 of the $ incised laterally with the outer margin raised as a high, 

 laminate wall reaching to half the length of the clypeus, and either 

 truncate at apex or gradually sloping there ; from the centre of the 

 base projects an horizontal lanceolate horn extending forward as far 

 as the lateral walls, the clypeus is broader than the lateral walls of 

 the head, parallel, quadrangular, but with the anterior margin pro- 

 duced in the centre into a laminate vertical process, sub-quadrate, 

 or slightly rounded at apex ; in the $ the head is simple but the 

 clypeus is strongly carinate above the outer margin from near the 

 eye almost to the anterior margin, and the sides project a good deal 

 beyond this ridge ; in the centre of both head and clypeus there is a 

 longitudinal elevation, forming in conjunction with the lateral ridges 



