176 ADEPHAGA. [Hydvo'porus. 



af . Punctuation rather strong ; 

 antenna3 long ; pubescence 

 long but scanty ; front of fore- 

 head red H. kcfifkons, Baft. 



\s\- Punctuation close ; antenna; 

 short ; pubescence very thick ; 



head black H. planus, F. 



b*. Length 3-3 J mm.; antennrewith 

 joints 5-8 oval, rounded. 



af. Elytra entirely black; pubes- 

 cence more scanty • . . . H. discretus, Fairin. 



bf. Elytra brownish with obscure 

 lighter markings at extreme 

 base and shoulders; pubescence 

 thicker H. pubescens, Oyll. 



cf. Elytra brown with plain yellow 

 markings at base and indis- 

 tinct markings at apex ; pubes- 

 cence long, but not thick . . H. lituratus, F. 



K. pictus, r. Oval, broadest in middle, elytra somewhat pointed 

 at apex, rather convex, sparingly pubescent, rather closely but distinctly 

 punctured ; head and sides of thorax red, disc of latter dark brown or 

 reddish ; elytra dark with two large and very irregular waved or den- 

 tate testaceous bands on each, one at base, and the other towards apex, 

 the extremities of which, as a rule, meet or almost meet on disc, and 

 enclose a large dark patch on each side ; the colour, however, is some- 

 times variable, and sometimes the four testaceous patches are small and 

 show no signs of meeting ; the suture and a broad space on either side is 

 always dark ; the strise on each side of base of thorax are very small ; in 

 the male the anterior tarsi are plainly dilated. Long. 2^, lat. 1| mm. 



Ponds, &.Q. ; common and widely distributed throughout the country ; local ia 

 Scotland, Tweed, Forth, Moray, Clyde ; Ireland, Belfast, Dublin, Armagh, &c. 



H. granularis, L. Oval, somewhat elliptic, rather depressed on 

 disc, someAvhat dull, slightly pubescent, finely but distinctly punctured ; 

 head and thorax brownish black, the latter with margins reddish ; elytra 

 black with two testaceous longitudinal lines on eacli, one near margin, 

 and one on disc, the latter dilated at base ; male with the anterior and 

 intermediate tarsi slightly dilated. Long. 2^-, lat. 1| mm. 



Ponds, &c. ; a local species, altliough sometimes abundant where it occurs ; Lee, 

 Horsell, and Woking in the Loudon district; Askham Bog (very common); Cam- 

 bridge, Wicken and Quy Fens, &c. ; Swansea ; Northumberland district ; not recorded 

 from Scotland or Ireland. 



H. flavipes, 01. Oblong oval, rather convex, with fine punctua- 

 tion and pubescence ; head black ; thorax black with margins plainly 

 testaceous, basal strise very minute ; elytra black with side border and 

 several longitudinal lines on each, more or less abbreviated, testaceous ; 

 these are, however, variable ; male with the posterior tarsi slightly 

 dilated. Long. 2% lat. U mm. 



Pouds, &c., especially iu heathy districts ; rather local, but not uncommon where 



