370 RHTNCHOPHORA. [R7linonCUS. 



B. Sides of thorax with a pointed tubercle ; 

 strisc of elytra much less broad than inter- 

 stices " R. CKRAMINEUS, F. 



(inconspectus, auct.) 



2. Form longer, narrower, and more oblong ; size 

 smaller ; elytra evidently longer than together 



broad R. PERPEirDicuLAKls,.Retc7i. 



(subfasciatiis, Gyll.) 



ii. Interstices of elytra, at least in part, furnished 

 with distinct tubercles or asperities. 



1. Elytra with a very distinct white patch at 



scutellum R. CASTOR, F. 



2. Elytra without or with a very indistinct white 



patch at scutellum R. BRUCHOIDE3, Herbst. 



II. Anterior margin of thorax with two raised tubercles 



in middle placed near one another R. DENTICOLLI8, Gyll. 



XI. pericarpius, L. (gramineus, F. (auct. nee vere) inconspectus 

 Herbst. nee auct.). Short oval, broad, convex, black, underside thickly 

 clothed with yellowish-white scales ; upper surface with fine grey hairs, 

 sides of elytra and a patch at base of suture covered with whitish scales ; 

 antennse and legs pitchy-red or ferruginous ; thorax transverse, deeply 

 punctured, with the apical margin depressed, gradually constricted before 

 apex, with very obsolete lateral tubercles ; elytra with strong punctured 

 strife, interstices flat, finely granulated ; legs stout. L. 2|-3| mm. 



Male with the posterior tibice armed with a hook and the last ventral 

 segment of abdomen with a small almost glabrous fovea at apex. 



On species of Polygonum, especially P. amp hibium var. terrestre, also on Rumex 

 obtusifolius and, according to Stephens, on thistles ; common and generally distri- 

 buted throughout the kingdom. There is a small variety in Dr. Power's collection 

 taken by him at Balinuto, Fifeshire. 



R. gramineus, F. (incon%)ectus, auct. nee Herbst.). Of about the 

 same size as the preceding, or, on an average, a little larger, Avith the 

 under surface thickly clothed with ashy scales and the upper surface 

 thickly chequered with greyish and yellowish -grey scales which are 

 thicker on suture and form a patch towards base ; the species may easily 

 be known from A . pericarpius by the duller and greyer appearance of 

 the upper surface and especially by its longer thorax which has a dis- 

 tinct tubercle on each side and the central channel evident, at all events 

 behind ; the apical margin, also, is slightly elevated and produced ; the 

 antennae and legs are reddish or ferruginous. L. 3-4 mm. 



Marshy places ; on Polygonum amphibium ; also in flood refuse, moss, &o. ; very 

 local and, as a rule, rare; Weybridge, Walton-on-Thames, Darenth, Merton, Egham, 

 Forest Hill, Staines, Sunbury, West Wickham, Kingsbury ; Norfolk; Deal; Sand- 

 gate, near Folkestone ; Amberley ; Faygate, Sussex ; Portsmouth district ; Exeter 

 district ; Weston-super-Mare ; Tevvkesbury ; Coleshill, near Birmingham ; Wickeu 

 Fen ; Lincoln (one specimen in flood refuse) ; Northumberland and Durham district, 

 very rare, South Shields; Scotland, very rare, Solway district. 



R. perpendicularis, Reich, (subfasciatus, Gyll.; guttalis, Grav.). 



