72 [August, 1880. 



longer and narrowed towards the front, being broader at the base ; 

 this is very noticeable in many examples of our common C. hisferoides, 

 which is very variable in the shape of the thorax. 

 The European species may be thus divided : — 



I. Antennae with the third joint much shorter than second. 



i. Thorax very finely punctured, very broad : general form broad, with elytra 

 strongly widened in middle : striae of elytra finely punctured . 



C. magnicolle, Reitter. 

 ii. Thorax finely punctured, but more distinctly than in the preceding species : 



general form oval, with elytra not strongly widened in middle : strise I 



of elytra finely punctured C. semistriatum, Perr. 



conicicolle, Reitter. 

 cetolicum, Reitter. 

 iii. Thorax strongly punctured : general form oblong : strise of elytra more 



strongly impressed and more coarsely punctured.. 



C. evanescens, Reitter. 



II. Antennae with the second and third joints of about equal length. 



i. Form, broader : upper surface pitchy-brown or nearly black. 



1. Antennae more slender : basal impressions of thorax transverse, and 



rather shallow : thorax rather closely punctured . . 



C. histeroides, F. 



2. Antennae thicker : basal impressions of thorax longitudinal and deep : ' 



thorax strongly and sparingly punctured C.fagi, Bris. 



ii. Form narrower and more parallel. 



1. Upper surface black : thorax with a slight prominence on each side 



margin, just at beginning of posterior third... 



C. atratulum, Reitter. 



2. Upper surface nearly always ferruginous-testaceous : thorax without 



prominences at sides. 



A. Upper surface slightly convex : sides of thorax almost parallel : 



basal impressions of thorax distinct : strise of elytra rather 



fine, becoming evanescent towards apex . . . 



C.ferrugineum, Steph. 



B. Upper surface much depressed : striae reaching apex. 



a. Thorax quadrate with basal impressions large and distinct : 



striae of elytra stronger C. impressum, Er. 



b. Thorax oblong, very slightly narrowed towards base, with basal 



impressions very indistinct : striae of elyti-a less strong... 



C. deplanatum, Gyll. 



C. MAGNICOLLE, Eeitter. 



Rather broad and convex, lighter or darker ferruginous : antennae moderate, with 

 third joint much shorter than second : thorax broad, with sides rounded and dilated 

 in front in male, somewhat narrowed in front or almost parallel in female, very finely 

 punctured : elytra dilated at sides at about one third the distance from base, and 

 thence gradually narrowed towards apex : striae of elytra (except sutural stria) 

 evanescent for apical third. Long., 2 mm. 



