202 ADEPHAGA. \_Rliantas. 



Ponds, «fcc. ; not uncommon, althoup:h rather local ; Lonrlon district; Norfolk and 

 Huntingdonshire Feus; Swansea ; Williug-ton, near Burton-on-Trent ; Askham Bog 

 and Stamford Bridge, York ; Northumberland and Cumberland : Scotland, local, but 

 widely distributed ; Ireland, Armagh. 



It. pulverosus, Stepli. Considerably larger than the preceding ; 

 head testaceous with dark markings ; thorax testaceous with a transverse 

 black spot on centre of disc ; elytra coloured as in R. exoletus, except 

 that the fine dark markings are more confluent, and give the insect 

 a more fuscous appearance ; underside black, coxal processes lighter ; 

 antennae and front pairs of legs testaceous, posterior pair pitchy ; male 

 with the basal joints of front and middle tarsi slightly incrassate and 

 very compressed, and furnished beneath with four rows of narrow 

 elongate palettes. Long. 12, lat. 6i mm. 



Ponds, &c. ; rather common in the London district, but very local elsewhere ; 

 Hastings ; Willington, near Burton-on-Trent ; it has been recorded from Exeter, 

 Swansea, and Yorkshire, and is rare in Northumberland ; very doubtful as Scotch, 

 " Forfarshire, Eev. W. Little, Murray's Cat.," being the only record. 



This species has an almost wider range than any other ; it reaches 

 right across Central and Southern Europe and Asia to China and Japan, 

 and is very abundant in Australia, New Zealand, and New Caledonia. 



R. notatus, Berg. Smaller and narrower than the preceding ; 

 upper surface coloured in much the same I'ashion except that the dark 

 markings are not so confluent, and are divided as a rule by very narrow 

 irregular testaceous lines ; antennaj testaceous with apex of last joints 

 black ; legs testaceous ; underside of male black, abdominal segments 

 with hind margins and markings testaceous ; of female testaceous 

 spotted with black at the sides ; male with basal joints of anterior tarsi 

 much thickened and very little compressed, presenting a broad sole with 

 rather large palettes. Long. lOj, lat. 5| mm. 



Ponds, &c. ; very local ; London district, not uncommon : Gravesend, Whitstable, 

 Sheerness, Wandsworth, Eeigate, Strood, Rainham ; fen districts of Cambridge, 

 Norfolk, &c. ; Aberystwith ; Carlisle ; Scotland, rare, Tweed, Forth, and Dee dis- 

 tricts ; I can find no record between these localities, but the species probably occurs 

 in Yorkshire and Northumberland. 



R. bistriatus, Berg. Oval, not very convex, underside black, Avith 

 the prosternum, and usually the hind margins of the abdominal seg- 

 ments reddish ; head testaceous with black markings, thorax testaceous 

 with the anterior margin narrowly and obscurely, and the posterior 

 margin broadly and sharply black ; elytra coloured as in the preceding 

 species, except that the markings are darker and more confluent and give 

 the insect a blacker appearance ; antennsa and legs reddish testaceous, 

 apical joints of former partly black ; male with front tarsi considerably 

 thickened and furnished with four rows of moderately large palettes. 

 Long. 10, lat. 5| mm. 



Ponds, ditches, &c. ; local in England ; not uncommon throughout the London 

 district; Hastings; Exeter; Repton, Burton-on-Trent; Norfolk and Cambridge- 

 shire Fens ; Streiisall, near York; Northumberland; Scotland, common in both Low- 

 lands and Highlands, and widely distributed. 



