296 CLAVICOHNIA. [Cuciijina. 



I. Thorax with margins dentate, without longitudiual 



lines on each side of disc PUDIACUS, Shuck. 



II. Thorux with margins simple, with at least one longi- 

 tudinal impressed line on each side of disc L-amoPHLCEUS, Er. 



PSBIACTTS, Shuckard. 



This genus contains a few species from North America, the Canary 

 Islands, &c. ; three are found in Europe, two of which occur very 

 rarely in Britain ; they live under bark. 



The larva of P. dermestoides is described and figured by Ferris, Ann. Fr., 1862, 

 p. 190, pi. 5, fig. 535 ; it is 6 mm. long, reddish, very depressed, with long setae at the 

 sides; the head is much broader than long, slightly broader than thorax, which is 

 longer than meso- and metathorax, and the first seven segments of abdomen are not 

 very different in length and breadth, and are narrowed in front and behind ; the 

 eighth segment is very long, as long as the three preceding together, with sides 

 nearly straight in front, and dilated behind into a small tubercle on each side ; the 

 ninth segment is long, much narrowed in middle, and terminated in a divergent 

 fork ; this larva has been found by Ferris parasitic on the larva? of Tomicus steno- 

 graphus. 



I. Thorax plainly transverse, with posterior angles form- 

 ing a very distinct sharp tooth P. DERMESTOIDES, F. 



II. Thorax about as long as broad, with posterior angles 



forming a very small blunt tooth P. DEPRESSES, Herbsf. 



P. dermestoides, F. Reddish-brown, somewhat shiny ; head 

 short, triangular, Avith eyes very prominent, antennae rather stout, with 

 3-jointed club, and with the seventh joint much broader than the 

 eighth ; thorax a little narrower than elytra, transverse, usually dark 

 brown or blackish with the edges lighter, rather thickly punctured, with 

 depressions on disc, sides with three or four indistinct teeth, posterior 

 angles forming a rather sharp tooth ; elytra parallel, flat, depressed on 

 each side of suture, very finely and obsoletely punctured ; legs reddish- 

 testaceous. L. 3-4 mm. 



Under bark and in chinks of freshly cut oak, beech, and hornbeam ; very rare ; 

 Chatham (Walker); Loughtou, Essex, and Cobham (Power); Hainault Forest; 

 New Forest ; Sherwood. 



P. depressus, Herbst. This species resembles the preceding in 

 general appearance, but is narrower, and is easily distinguished by its 

 longer thorax, of which the lateral teeth are more pronounced, and the 

 posterior angles only form a small blunt tooth ; the colour is lighter, and 

 the general appearance is more shiny ; the antennae are longer with 

 the third joint plainly longer in proportion, and the legs are stouter ; 

 the colour is reddish-testaceous, and the thorax is not darker as is the 

 rule with the preceding species. L. 3-4 mm. 



Under bark of oaks, &c. ; rare; Knutsford Park and Stretford near Manchester 

 ( Hardy), out of chinks of very rotten oak, in a yellowish, minute fungus, like mould ; 

 Duuham Park, Manchester, in Cossus burrows (Chappell) ; fctrctford, on the winy 



