194 CLAVICORNIA. [Cb 



the former of which has the club plainly 2-jointed, whereas in the latter 

 it is solid ; they are small oblong or oval insects, and are distinguished 

 by having the last joint of the palpi small and acicular, and the penulti- 

 mate joint dilated ; all the coxae are widely separated ; the genus Cerylon 

 alone occurs in Britain. 



CERYLON, Latreille. 



About thirty species are contained in this genus, which are widely 

 distributed throughout the world, representatives being found in North. 

 and South America, Ceylon, Tahiti, New Caledonia, Madagascar, &c. ; 

 nine or ten species are found in Europe, of which four are British ; for 

 a description of these the student is referred to a paper by myself in the 

 Entomologists' Monthly Magazine, vol. xxiii. pp. 71-76 ; the species are 

 small robust insects, and live under bark of decaying trees, logs, &c. ; 

 sometimes they are found in ants' nests ; the shape of the thorax differs 

 considerably in the two sexes, a point that must be carefully noticed. 



The larva of C. histeroides is described by Ferris (Ann. Fr. 1853, p. 616) ; it is elon- 

 gate, somewhat parallel, entirely white with reddish head ; head depressed, antennae 

 4-jointt'd, with the last joint as long as all the preceding ; prothorax longer than 

 either meso- or metathorax, both of which are longer than the abdominal segments, 

 which are of equal length until the last, which is somewhat developed, and has on the 

 back two papilla, each furnished with a longhair; it is deeply emarginate behind, and 

 the lobes of the emargination appear to be trifid at apex ; tarsi short and stout, 

 3-jointed ; legs ciliate. The larva, according to M. Penis, lives in the galleries 

 of Hylurgus piniperda, of which it destroys the larva ; it is also found in other trees 

 than pine trees, where it probably destroys the larvae of other wood-boring beetles. 



I. Form broader; upper surface pitchy-brown or nearly 



black, 

 i. Antennae more slender ; basal impressions of thorax 



transverse and rather shallow; thorax somewhat 



closely punctured 0. HiSTEEOiDES, F. 



ii. Antennas thicker; basal impressions of thorax 



longitudinal and deep ; thorax strongly and spar- 



ingly punctured C. FAGi, Bris. 



II. Form narrower and more parallel; upper surface nearly 



always ferruginous testaceous. 



i. Upper surface slightly convex ; sides of thorax almost 

 parallel ; basal impressions of thorax distinct ; striae 

 of elytra becoming evanescent towards apex . . . C. PEBRUGINEUM, Steph. 



ii. Upper surface much depressed ; striae of elytra reach- 

 ing apex C. DEPLANATUM, Oyll. 



C. histeroides, F. Dark pitchy-black, ferruginous or reddish- 

 ferruginous in immature examples, not very convex ; antennas ferruginous ; 

 thorax thickly and rather strongly punctured, in the male a little shorter 

 than broad, and a little widened and rounded in front, so that its greatest 

 breadth is before middle ; in the female it is just as long as broad, very 

 slightly and almost imperceptibly narrowed in front, so that it is broadest 

 at base ; elytra slightly dilated and widened at sides, rather depressed, 



