288 OLAVICORNIA. [Corticaria 



five segments visible in tlie female, and in the male th<jre is a small 

 additional sixth segment, visible beneath ; the form is oblong, some- 

 times cylindrical, sometimes elongate and depressed ; the thorax is always 

 more or less distinctly crenulate at the sides ; there are thirty-three 

 European species, of which eight are at present recognized as British ; 

 in all probability, however, we possess two or three more in collections, 

 but the question is not yet settled, owing to the great variation of some 

 species in colour, and also in structure and sculpture. 



I. Elytra without regular rows of punctures or marked 

 interstices ; abdomen with the fifth ventral segment 



deeply foveate in both sexes. 

 i. Thorax at its greatest breadth distinctly narrower 



than elytra ; all the joints of the club of the antennas 



evidently longer than broad ; size larger . . . . C. PTTBE5CENS, Gyll. 

 ii. Thorax at its greatest breadth as broad or nearly as 



broad as elytra ; first two joints of the club of the 



antennae about as long as broad C. CBENULATA, Qyll. 



II. Elytra with regular rows of punctures, and more or 

 less distinctly marked interstices ; abdomen with the 



fifth ventral segment not or not deeply foveate. 

 i. Elytra with rather long aud upright pubescence, 



disposed in even rows, and plainly longer on the 



alternate interstices ; elytra elongate-oval . . . . C. PtriVA, Com. 

 ii. Elytra with fine even recumbent pubescence with 



rows of short hairs sometimes intermingled, which, 



however, are never longer on the alternate in- 

 terstices. 



1. Form elongate, cylindrical, or parallel-sided, 



elytra as broad as thorax. 



A. Upper surface convex ; eyes very prominent; 



elytra with rows of coarse punctures . . C. UMBILICATA, Seek 



(cylindrica, Mauuh.). 



B. Upper surface depressed ; eyes not strongly 



prominent j elytra with rows of fine punctures . C. ELONGA.TA, Gyll. 



2. Elytra depressed and parallel-sided much broader 

 than thorax, which is cordiform ; punctures of 



interstices of elytra as large as those of striae . . C. OBSC0BA, JBris. 



3. Elytra convex, oblong-oval ; thorax more or less 



cordiform. 



A. Elytra with punctured striae continued to 



apex. 



a. Elytra with rather broad smooth interstices 

 furnished with distinct series of minute punc- 

 tures j size larger C. DENTICULATA, Gyll. 



b. Elytra with rather narrow interstices which 

 are somewhat wrinkled, and are furnished 

 with indistinct rows of smaller punctures; 



size smaller C. SEHBATA, PayTc. 



B. Elytra with punctured striae evanescent behind 



middle C. PENESTRALIS, L. 



C. pubescens, Gyll. ( punctulata, Marsh.). The largest of the 

 British species ; colour very variable, head and thorax usually fusco- 

 ferruginous, elytra pitchy with shoulders more or less broadly paler 



