240 Mr. M. Jacoby on 



black, the fifth and following joints triangularly flattened ; thorax 

 very convex, scarcely twice as broad as long, the sides feebly rounded 

 with a pale coloured broadly reflexed margin, the basal margin finely 

 serrate and black, the surface with some minute punctures, only 

 visible under a strong lens, the scutellum ovate, pale fulvous, elytra 

 strongly and closely punctate-striate, the punctures closely placed 

 and regularly so near the suture and the lateral margins, the space 

 between the sixth and the next row, irregularly punctured ; below 

 and the legs fulvous, closely punctured, prosternum widened at the 

 base, the latter straight. 



Hah. Niger-Benue Exped. 



This Cryptocephalus is of quite different structure to 

 any of its African congeners, and will therefore not be 

 difficult of recognition, the reflexed margins of the thorax 

 and the partly regular partly irregular elytral punctuation 

 are characters rarely to be met with in species of this 

 genus. I only know a single specimen which I received 

 from Herr Bang-Haas. 



Ach&nops mandibularis, sp. n. 



Below black, the basal joints of the antennas and the legs fulvous, 

 head rugosely punctured, black, mandibles large and prominent, 

 thorax finely punctured, black, the lateral and anterior margins and 

 two spots at the base, flavous, elytra finely punctate-striate, the 

 suture,' a narrow transverse band at the base and a broader one near 

 the apex, black. 



Length 3 millim. 



Head broad and flat, black, rugosely punctured, the eyes with a 

 short and rather feeble emargination, the clypeus with a broad pro- 

 jecting sub triangular prolongation at each side, deeply excavated in 

 front, the mandibles broad and robust, curved, antennas short, the 

 terminal six joints transversely widened, black, the others flavous, 

 the third and fourth joint short, equal, thorax about one half broader 

 than long, the sides rather strongly rounded and narrowed anteriorly, 

 the posterior angles acutely produced, the surface minutely and closely 

 punctured throughout, black, the anterior margin narrowly, the 

 lateral ones more broadly flavous, the black portion also divided by 

 a narrow central flavous line and by two oblique spots of similar 

 colour at the base ; elytra rather finely and regularly punctate- 

 striate, the interstices likewise finely and sparingly punctured, 

 flavous, a narrow sutural and a transverse band at the base not quite 

 extending to the latter nor to the lateral margins and another broad 



