Pltiltuliuy.~\ RHTXCHOPHOBA. 377 



the latter character will also distinguish it from A. Wcdtoni and .4. quad- 

 rituberculatus, from the former of which it may at once be further 

 separated by the evident channel on the thorax, and from the latter by 

 not having the forehead excavate between eyes and the elytra not 

 roughened behind at sides ; the colour is black with the underside and 

 sides of thorax thickly clothed with white scales and the elytra variegated 

 with patches of the same ; the scape of the antennae, and the tibiae, are 

 ferruginous or yellowish, the latter being sometimes fuscous in middle. 

 L. 2 mm. 



Male with the intermediate tibiae armed with a small hook and the 

 last segment of the abdomen transversely impressed at apex. 



Marshy places ; on aquatic plants ; local, bat not uncommon in some districts ; 

 Woking, Caterham, Esher, Walton-ou-Thames, Longhton, Chatham, Sbeerness; 

 Windsor Forest ; Portsmouth district ; New Forest ; not as yet recorded from the 

 Midland counties ; Heysham, near Lancaster; Northumberland and Durham district, 

 Prestwick Carr and Gosforth ; Scotland, scarce, Solway and Moray districts. 



P. quadricornis, Gyll. Black, not very dull, with the under 

 surface, sides of thorax, and a spot at base of suture thickly clothed 

 with white scales, the remainder of the upper surface with very scanty 

 and often scarcely apparent scales ; legs ferruginous with the apex of 

 femora, and the tarsi, fuscous ; rostrum very short and thick, base of 

 antennas red ; thorax transverse, gradually narrowed but not or scarcely 

 constricted in front, closely and rather strongly punctured, without 

 central furrow and with four tubercles, two, widely separated, at apical 

 margin, and two before base ; elytra with deep and rather broad 

 punctured striae, interstice's finely rugose, somewhat asperate at sides, 

 tarsal claws bifid. L. 2-2^ mm. 



Male with the intermediate tibiae armed with a hook and the fifth 

 ventral segment of the abdomen transversely impressed at apex. 



Marshy places; on aquatic plants, especially Polygonum lapathifolium ; rare; 

 London district (Stephens) ; Sheerness (J. J. Walker) ; formerly in Battersea Fields, 

 also in marshes near Broxbourne (8. Stevens); Ireland, near Dublin (McXab) ; 

 I believe that it was also taken by Mr. Sidebotham but I do not know the locality. 



P. quadrinodosus, Gyll. Short oval, convex, black, with the 

 underside and a patch at suture (sometimes obscure) thickly clothed 

 with greyish scales, which are also somewhat thick towards apex and are 

 very scantily scattered over the rest of the upper surface in fresh 

 specimens ; antennae and legs ferruginous ; thorax deeply and closely 

 punctured, narrowed and somewhat constricted in front, with four 

 tubercles, two at anterior margin, the interval between which forms a 

 small incised angle, and two behind middle, disc channelled ; elytra 

 rather broad, with deep and rather broad striae, interstices at sides with 

 a few rather large tubercles. L. 2 mm. 



Male with the posterior tibiae armed with a hook, abdomen with 

 segments 2-5 rather strongly impressed, the impression being longitu- 

 dinal and bounded with white pubescence on each side. 



