On Aquatic Carnivorovs Colcoptera or Dytisckhe. 473 



3Ias, tarsis auterioribus et intermediis paulo latioribus, illis unguiculis elougatis 

 et crassis, apicibus fissis, anteriore paulo longiore. 



Northern Europe. (Sweden ; Finland ; England ; the Somme, France ; Germany). 352. 



605. Hydroporus angustatus, Sturm, M.C.— Oblongo-ovalis, elongatus, evidenter 

 pubescens, subtus nigricans, supra fusco-ferrugineus, capite thoraceque magis rufis, 

 pedibus rufis, antennis gracilibus fuscis, basi rufo ; prothorace sparsiui, basi crebrius 

 punctato ; elytris crebre evidenter puuctatis ; coxis posterioribus sat crebre et 

 fortiter punctatis; tarsorum anticorum articulo tertio elongato. Long. 3, lat. 

 li m.m. 



Mas, tarsis anterioribus fortiter (prsesertim art. 3°) dilatatis, unguiculis incrassatis 

 apico tenuibus, anteriore longiore ; tibiis intermediis intus sinuatis, tarsis evidenter 

 dilatatis; tibiis posterioribus medio latioribus, dimidio apicali angustiore intus 

 densius brevissime asperato-setoso. 



This is a very distinct little species with remarkably developed male characters. 



Northern and Central Europe ; Siberia. (Sweden, Finland, Britain, France, Germany). 351. 



606. Hyphydrus umbrosus, GylL, Hydroporus umlrosus, M.C. — Ovalis, sat 

 convexus, evidenter pubescens, fere opacus, niger, capite, elytris pedibusque fusco- 

 rufis, antennis fuscis, basi rufo; thorace in disco minus crebre punctato, elytris, sat 

 distincte punctatis ; coxis posterioribus sparaim fortiter punctatis ; pedibus crassius- 

 culis. Long. 2+, lat. Ij m.m. 



The male is difficult to identify, the front tarsi being broad in each sex, but 

 they are broader in the male ; the claws are small and simple. There appears to 

 be two forms of the species, one more elongate and brighter coloured than the 

 other, but I am unable to find any certain specific characters to distinguish them. 

 Both of these forms have the apical ventral segment more distinctly punctured 

 tlian is the case in the allied species. 



Northern and Central Europe; Siberia. (Sweden; Finland to 68^ 30' NOrth, Sahlberg; Britain, 

 France, Germany). 350. 



607. Hyphydrus striola, GjW., Hydroporus striola, M.C. — Ovalis, sat convexus, 

 parcius pubescens, subopacus, subtus nigricans, supra fusculus, cajiite fusco-rufo, 

 prothoracis lateribus anguste elytrisque signaturis externis et basali vage testaceis, 

 pedibus sordide runs, antennis fuscis basi rufo ; prothorace sat fortiter minus crebre 

 punctato, elytris parce punctatis ; coxis posterioribus sparsim obsolete punctatis. 

 Long. 3i, lat. if m.m. 



The male has the tarsi distinctly dilated, but the two claws of the front ones are 

 nearly similar. 



