2G8 CLAVICORNIA. [Trognsitina. 



TROGOSITINA. 



This tribe contains two British genera ; the species are elongate, but 

 differ very mnch in appearance, Tenebrioides being rather broad and flat, 

 and Nemosoma very long and narrow and cylindrical ; they are charac- 

 terized by having the clypeus trisinuate or emarginate in front, and by 

 having the anterior coxae entirely enclosed ; the antennte in our species 

 are 11-jointed, and the last three joints form a more or less distinct 

 club. 



1. Form very imrrovv and cvliudrical ; eyes rounded . . . Nemosoma, X«/r. 

 II. Form elongate-oblong; eyes transverse Tknebrioides, PiW. 



KEMOSOS^A, Latreille. 



This genus contains a iQ\y species which are found in Europe and 

 !N"orth America ; they occur in wood, and appear to be parasitic on species 

 of llylpsinus, &c. 



The larva of N. elongatum is fully described by Erichson (Naturgesiclite der Ins. 

 Deutsdi. iii. 239), and is also described and figured by Westwood (Classif. i. 146, 

 fig. 12, 2) ; it is closely allied to that of Tenebrioides, but is longer, thinner, and 

 more cylindrical, with less long and less numerous hairs; according to Westwood 

 this larva has a very quick motion when excited, and when touched throws itself 

 into various attitudes like a small Stapbylinus; unless excited its movements are slow 

 like the imago; the head is flat, and in walking it is constantly in motion from side 

 to side, or upwards and downwards; the larva by means of au anal proleg is able to 

 move backwards or forwards. 



N. elong"atum, L. Shining black, with the basal third (or occa- 

 sionally half) of elytra and a patch before apex of the same reddish- 

 testaceous ; this patch varies in size, and is sometimes obsolete ; form 

 very narrow, elongate, cylindrical, parallel-sided ; head as long as thorax, 

 with rather long distinct punctures, and a deep frontal furrow, antennae 

 reddish-testaceous with distinct 3-jointed club ; thorax much longer 

 than broadj slightly narrowed behind, finely and diffusely punctured ; 

 elytra two and a half times as long as thorax, finely punctured almost 

 in rows, with a fine impressed line near suture ; legs reddish-testaceous. 

 L. 4 mm. 



Under bark in company with Hylesinus vittatus, on which it is parasitic — especially 

 in old palings ; of very rare occurrence, but sometimes locally common ; Darenth 

 Wojd (Stephens) ; Sydenham (Ingall and Westwood, 1833 ; Power, 1852) ; Cliesliire, 

 Whatcote, and Compton Wyuniat (Power) ; Warwickshire ; Beeston, Notts (Side- 

 botham). 



TENSBHIOIDSS, Filler. 



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

 distributed, occurring in both tropical and temperate regions ; of those 

 at present known a very large proportion appears to come from North 

 America ; one species only is found in Eui'ope, which has been dis- 



