/'*.] SERRICOUXIA. 205 



II. Antennm 9-jointed ENNKARTHKON. Mell. 



III. Antennae 8-joiuted OCTOTKMNCS, Mtll. 



CIS, Latreille. 



This genus comprises more than a hundred species, of which about 

 forty occur in Europe ; the rest are widely distributed, representatives 

 having been recorded from the Atlantic Islands, South Africa, Mada- 

 gascar, North and South America, Japan, Ceylon, &c. ; they are, as a 

 rule, small and obscure insects, but in many cases the clypeus and 

 anterior margin of the thorax are armed in the male with horns or 

 lamellae which present a very curious appearance ; many of the species 

 are very closely allied and are hard to distinguish, the differences often 

 depending on the comparative strength of the punctuation and pubes- 

 cence ; it is obvious, therefore, that a table of species must be more or 

 less unsatisfactory, and the one given below must be regarded as pro- 

 visional, and must not be trusted without a reference to the detailed 

 descriptions. Thomson divides the genus into separate genera, Hadraule, 

 Eridanlus, and Ct's, i. pp., but the distinctions he gives hardly warrant the 

 separation, and they have not been generally adopted. 



I. Thorax uneven, with irregular impressions on 



disc. 



i. Impressions on thorax rather distinct, base 



not bordered C. BOLBTI, Scop. 



(rvgulosus, Mell.) 



ii. Impressions on thorax more or less obso- 

 lete, base bordered C. VILLOSDLU8, Marsh. 



II. Thorax with disc even. 



i. Thorax in male with two strong and pro- 

 jecting teeth on anterior margin ; pubes- 

 cence very scanty C. BIDKNTATFS, Ol. 



ii. Thorax of male without, or with obsolete, 

 teeth ou anterior margin. 



1 . Pubescence very scanty, or almost absent ; 



upper surface shiny or very shiny. 



A. Form longer ; elytra unevenly punc- 



tured. 



a. Size larger; form broader and more 

 depressed; posterior angles of tho- 



rux almost right angles C. AI.M, Gyll. 



b. Size smaller ; form narrower and 

 more convex ; posterior angles of 



thorax rounded. 



a*. Anterior angles of thorax pro- 

 duced ; colonr lighter . . . . C. NITIDFS, Jferbtt. 



b*. Anterior angles of thorax not 

 produced ; colonr darker . . . C. JACQCEMARTI, iff II. 



B. Form very short ; elytra strongly and 



rather evenly punctured in row* . . C. IIKKATOCBIBBATTTS, Mell. 



2. Pubescence distinct, rendering the upper 



surface, as a rule, more or less dull. 

 A. Elytra rather rrgnlarly etriate-punc- 



tatc ; form elongate and depressed . . C. ELONGATULUB, Gyll. 



