South African Coleopterous Fauna. 271 



broader, the frontal suture quite arcuate and set considerably 

 forward ; antenna? reaching slightly beyond the median part of the 

 prothorax, the first five joints are reddish, shorter, taken together, 

 than the five ultimate ones, sixth and seventh joints a little less 

 broad than the three following which are sub-transverse, last joint 

 oblong, one-third longer than the penultimate ; prothorax one-third 

 longer than broad, parallel with the anterior angles rounded, but 

 with the lateral margin laminate and ending in a sharp basal angle, 

 moderately depressed on the disk, covered with round, slightly 

 irregularly disposed punctures separated by smooth intervals, and 

 having in the centre a longitudinal line somewhat evanescent 

 except in front, posterior margin slender, very little raised ; scutellum 

 very small, sparingly punctate ; elytra cylindrical, costate, the costae 

 sub-tectiform and very finely aciculate, the intervals narrow, deep, 

 and filled with small, equally distant punctures united by an im- 

 pressed line ; abdomen closely punctulate, and without any traces 

 of striolation ; legs and sternum more finely punctulate than the 

 abdomen. 



The shape of the body of this species, and also of the following one, 

 greatly resembles that of Chalcostylns perrieri, Fairm., from Mada- 

 gascar. The shape of the antennal joints is, however, very distinct. 



Length 11 mm. ; width 3^ mm. 



Hab. Mozambique (Beira). 



NANNOCERUS BEIBANUS, n. sp. 



The description of N. angustulus applies also to this species which 

 is dark-cyaneous, almost black, but with the elytra violaceous blue 

 tinged with purple, the five basal joints of the antennae are 

 black; the shape of the head and prothorax is the same, but the 

 intervals of the elytra are more deeply punctate, and the costae have 

 occasionally a few fine punctures ; the general facies is more robust 

 than in S. angustulum. 



Length 12-14 mm. ; width 4-4^- mm. 



Hab. Mozambique (Beira). P. A. Sheppard. 



DIESTESOMA, n. gen. 



Mentum small, not impressed on each side of the outer face, 

 ligula short, last joint of labial palpi large, spherical, broadly trun- 

 cate at tip ; outer lobe of maxillae long, widely dilated, elongate-ovate, 

 clothed with appressed bristle-like hairs, inner lobe narrow, slender,. 



