On Aquatic Carnivorous Coleoptera or Dytiscide. 473 
Mas, tarsis anterioribus et intermediis paulo latioribus, illis unguiculis elongatis 
et crassis, apicibus fissis, anteriore paulo longiore. 
Northern Europe. (Sweden; Finland ; England ; the Somme, France; Germany). 392. 
605. Hydreporus 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 sparsim, basi crebrius 
punctato ; elytris crebre evidenter punctatis ; coxis posterioribus sat crebre et 
fortiter punctatis; tarsorum anticorum articulo tertio elongato. Long. 3, lat. 
14 m.m. 
Mas, tarsis anterioribus fortiter (preesertim art. 3°) dilatatis, unguiculis incrassatis 
apice tenuibus, anteriore longiore ; tibus 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 maie characters. 
Northern and Central Europe; Siberia. (Sweden, Finland, Britain, France, Germany). 351. 
606. Hyphydrus umbrosus, Gyll., Hydroporus wmbrosus, 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 sparsim fortiter punctatis ; pedibus crassius- 
culis. Long. 23, lat. 13 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 
than 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, Gyll., Hydroporus striola, M.C.—Ovalis, sat convexus, 
parcius pubescens, subopacus, subtus nigricans, supra fusculus, capite fusco-rufo, 
prothoracis lateribus anguste elytrisque signaturis externis et basali vage testaceis, 
pedibus sordide rufis, antennis fuscis basi rufo; prothorace sat fortiter minus crebre 
punctato, elytris parce punctatis; coxis posterioribus sparsim obsolete punctatis. 
Long. 34, lat. 13 m.m. 
The male has the tarsi distinctly dilated, but the two claws of the front ones are 
nearly similar. 
