Omaseus.] adephaqa. 65 



B. Abdomen impnnctato. 



a. Leuf^-tli H iiiii).; form wider; anal segment of 



abdomen in male simple in both sexes .... P. QKACILIS, Dej. 



b. Length 6 nun. ; form narrower; anal segment 

 of abdomen in male with a fine raised longitudinal 



line P. MiNOE, G^ll. 



P. nigrer, Schall. Obloiiff, black, rather dull ; antcnnai with throe 

 basal jdiiits 1 (lack and glabrous, the rest fuscous and pubescent; thorax 

 quadrate, slightly rounded in front and narrowed behind, sides almost 

 str.iight from middle to l^ase, side margins reflexed, posterior angles right 

 angles, somewhat bluntly produced into a point, dorsal furrow distinct, 

 base with a shallow double oblong depression on each side ; elytra 

 broader than thorax, slightly widened behind middle, deeply striated, the 

 striai obsoletely punctured or quite impuuctate ; male with a strong 

 elevated longitudinal carina ending in a tubercle on the last abdominal 

 segment, of which traces may be seen in the female ; legs pitch-black. 

 L. 18-20 mm. 

 Under stones, loose bark, &c. ; common and generally distributed. 



P. vulg-aris, L. [melavaruis, 111.). Deep black, shining ; thorax 

 subi[ua(lrate, with sides gradually rounded from front to base, posterior 

 angles blunt, the apex produced into a more or less sharp tooth, margins 

 rellexed, disc much wrinkled, dorsal furrow ilistinct and complete, base 

 with two deep confluent foveiie on each side ; elytra broader than thorax, 

 dilated slightly behind middle, with deep impunctate stria; ; last abdo- 

 minal segment simple in both sexes ; legs black. L. 15-17 mm. 



Under stones, &c. ; common and generally distributed. 



P. anthracinus, 111. (/iiaurus, F.). Deep black, antennae black, 

 sometimes partly fuscous and apex testaceous ; thorax slightly transverse, 

 sid('3 rounded in front, contracted behind, posterior angles sharp right 

 angles, ape.x acute, produced, dorsal furrow distinct, base with the usual 

 depressions deep and strongly punctured ; elytra strongly striated, strite 

 obsoletely punctured, interstices rather flat ; distinguished from all tho 

 other species by the little tooth at the sutural angle of elytra in female, 

 and the deep depression on the anal segment in male. L. 9-11 mm. 



Ijocal, but widely distributed ; niarsbj- places, at roots of grass, &e. ; formerly 

 abundant at Notting Hill and Hammersmith Marshes (in the latter locality 

 Dr. Sharp took a variety with the apices of the elytra simiile) ; Wliittlcsea Mere : 

 Bath; Chiistcluircli, Hants; Tewkesbury; Tollbridge; Shipley; bover ; Hytlie, 

 Sheerness ; Walton-on-Thames ; Weybridge ; Hornsea and Scarborough, Yorkshire ; 

 Scotland, Grampians (Rev. A. E. Hodgson) ; also recorded from Ireland. 



P. nig-rita, F. Very like the preceding in colour, size, and form, 

 but less oblong, with the posterior angles of thorax less acute, and the 

 basal foveas shallower; distinguished also by having the sutural angle nf 

 the elytra simple, and by the fact that instead of being furnished with a 

 depression the anal segment of male Viears a small b\it distinct tubercle. 

 L. 8-11 mm. 



