2C8 CLAVICORNIA. [Trogositinci. 



TROGOSITINA. 



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

 differ very much 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 coxro entirely enclosed ; the antenme in our species 

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

 club. 



I. Form very narrow and cylindrical ; eyes rounded . . . NEMOSOMA, Lafr. 

 II. Form elongate-oblong ; eyes transverse TKNEBBIOIDES, Pill. 



NEMO SO IMA, Latrcillc. 



This genus contains a few species which are found in Europe and 

 North America ; they occur in wood, and appear to be parasitic on species 

 of Hylesinus, &c. 



The larva of N. elongatum is fully described by Erichson (Naturgesichte der Iiis. 

 Deutsch. 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 Staphylinns ; 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 an anal proleg is able to 

 move backwards or forwards. 



N. elongatum, 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, antennas 

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

 than broad, 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 pnlings ; of very rare occurrence, but sometimes locallv common ; Darenth 

 Wood (Stephen.*) ; Sydenham (Ingall and Westwood, 1833 ; Power, 1852) ; Cheshire, 

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

 botharn). 



TENEBRIOIDES, 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 Europe, which has been dis- 



