1900.] Catalogue of the Colcoptcra of South Africa. 559 



laterally, but gradually ampliate from the median to the posterior 

 part, not very callose behind, and having the median dorsal part 

 deeply and closely punctured for half the length, while the sides are 

 slightly rugose or less distinctly punctate in the anterior part ; upper 

 part of pygidium densely hairy, the lower margin is also fringed 

 with long fulvous hairs, abdominal segments punctulate and hairy, 

 especially the apical one, which has a fringe of very long hairs. 



Length 30-33 mm. ; width 16-171 mm. 



Hab. Cape Colony (Cape Town, Stellenbosch, Worcester, Mossel 

 Bay). 



Gen. EHIZOPLATYS, Westw., 



Proceed. Entom. Soc. Lond., 1841, p. 38. 



Trionychus, Burm. 



Mentum very broad, attenuate at base, sub-parallel laterally, 

 not narrowed and transverse at tip and entirely hiding the ligula 

 which is much reduced, densely hairy and soldered with tlie 

 inner face of the mentum, labial palpi moderately long, apical 

 joint sub-cylindrical but finely carinate inwardly, rounded at tip, 

 and having a few deep setigerous punctures very remote, the basal 

 joint is about two-thirds of the length of the apical one, and the 

 intermediate is very short ; upper lobe of maxillary palpi produced 

 into a very sharp strongly curved tooth, hollowed inw^ardly, and 

 having another beneath, equally sharp, but not so much curved, 

 and under this second one, a transverse row of three, less sharp 

 and connate at base ; head truncate in front of the gense which 

 are transverse, clypeus triangular and slightly refiexed at apex, no 

 clypeal carina, but instead a short tubercle in both sexes ; mandibles 

 projecting beyond the clypeus, angular outwardly in the anterior 

 margin and sharply dentate at tip ; antenna ten-jointed, basal 

 joint very thick, intermediate ones very short, thick, set very 

 closely upon each other, club sub-reniform, as long as all the 

 intermediate joints ; prothorax very httle convex, a little amphate 

 laterally at middle, marginate all round, and with the posterior 

 angles very sharp, excavate or impressed in both sexes in the 

 anterior part, but less deeply in the female than in the male ; elytra 

 elongate, not much convex, declivous behind, sub-parallel, more 

 or less deeply aciculate and only very faintly striate ; propygidium 

 covered in the centre with very fine, short, irregular folds set close 

 to one another, and being probably organs of stridulation ; pygidium 

 not very convex except towards the apical part in the male ; 

 abdomen deeply punctured ; median part of metasternum very little 

 depressed ; prosternum with the intercoxal process very sloping, 



