1900.] FEOM SOUTH AND CENTRAL APEICA. 237 



Length 5 millim. 



Head impunctate, with a distinct fovea between the eyes ; the 

 clypeus subquadrate, separated from the face by an obsolete 

 transverse groove, impunctate, its anterior edge concave at the 

 middle ; eyes distant, notched ; antennae slender, the lower six 

 joints fulvous, the rest black, second joint elongate, nearly as loug 

 as the third, terminal joints scarcely shorter ; thorax twice as 

 broad as long, narrowed iu front, the sides straight, the surface 

 finely and subremotely punctured, impunctate near the lateral 

 margins; elytra moderately strougly punctate -striate, the 

 punctures closely placed, distinct to the apex, the interstices flat, 

 with single very fine punctures ; below and the legs fulvous, the 

 femora with an extremely minute tooth. 



Bab. Boma, Congo. (Coll. Belgian Mus. and my own.) 



Of this Rhembastus three specimens are before me, of which 

 one shows a slight metallic gloss at the apex and at the sides of 

 the elytra. The species is no doubt closely allied to R. striatipennis 

 Lefev., R. jiavidus, and R. nigritarsis, but seems to differ from all 

 in the minutely punctured interstices of the elytra, or the 

 sculpturing of the thorax and the impunctate head ; the uniformly 

 coloured legs separate the species from R. nigritarsis, and the very 

 minute tooth of the femora and other details from R. collaris 

 Gerst. 



Bhembastus ikregulabis, sp. n. 



Below black, above dark metallic greenish, the basal joints of 

 the antennae fulvous ; head and thorax closely and finely punctured ; 

 elytra strongly punctate-striate near the suture, much more closely 

 and irregularly punctured at the sides. 



Length 4 millim. 



Head closely punctured, the clypeus not separated from the 

 face, mandibles robust, piceous ; eyes surrounded by a very narrow 

 sulcus ; antenna? not extending much below the base of the elytra, 

 black, the lower six joints fulvous, terminal joints thickened ; 

 thorax twice as broad as long, widened at the middle, the sides 

 obliquely narrowed anteriorly, the surface closely and distinctly 

 but finely punctured ; elytra ovate, convex, more strongly punc- 

 tured, the punctures arranged in more distinct rows near the 

 suture, the others much more closely placed and less regular, all 

 the punctures distinct to the apex ; breast and abdomen black ; 

 legs with a metallic green or aeneous gloss, the tarsi more or less 

 fulvous or piceous ; prosternum twice as long as broad, narrowed 

 at the middle, impunctate. 



Rah. Boma and Matadi, Congo. (Coil. Belgian Mus. and my 

 own.) 



R. irregularis may be separated from any of its congeners by 

 the punctation of the elytra, which differs from other species in 

 not being regular but only partly so ; the punctation of the head 

 and thorax will further help to distinguish the species. 



