On Aquatic Carnivorous ColcMptcra or Dijtiscidce. 4G9 



591. Hydroporus nivalis, Heer, M.C. — Oblongo-ovalis, subdepressas, tenuiter sed 

 evidenter pubescens, sat nitidus, crebrius sat subtiliter punctatus, niger, pedibus 

 fuscis, antennarum basi fusco-rufo ; coxis posterioribus crebre evidenter punctatis, 

 abdomine segmento apicali obsolete punctato sed apice summo distincte punctato. 

 Long. 3f. lat. 2 m.m. 



The sexes are difficult to distinguish. The colour of the elytra sometimes becomes 

 paler than the rest of the surface, but never leaves marks or spots. 



Europe. An Alpine species found from Styria to the Pyrenees : Styria, Austrian Alps, Lago Pinter, 

 Hautes Pyrenees. Found once in Finland, 64° North, according to Sahlberg. 3GG. 



592. Hydroporus signatus, jMann., M.C. — Oblongo-ovalis, minus convexus tenuiter 

 pubescens, sat nitidus, abdomine pectoreque nigris, supra fusculo, prothorace 

 lateribus rufescentibus, elytris signaturis humeralibus, maculaque indistincta apicali 

 testaceis, pedibus rufis, antennis fusco-ruiis basi dilutiore ; prothorace ante basin 

 transversim depresso, limbo subobsolefce punctato, disco fere impunctato ; elytris sat 

 crebre, distincte punctatis ; coxis posterioribus sat crebre evidenter punctatis. Long. 

 3|, lat. if m.m. 



The distinctions between the sexes seem to be extremely slight. 



North America, (Hermit Lake, Mt. Wn. N.H.). 365. 



593. Hydroporus longiuscuhis, Har., M.C. — Oblongo-ovalis, minus convexus, 

 tenuiter pubescens, minus nitidus, abdomine pectoreque nigris, capite fusco-rufo, 

 prothorace fusco, limbo evidenter, disco sparsim obsolete, punctato, elytris fusco- 

 ferrugineis, sat crebre et fortiter punctatis ; antennis pedibusque rufescentibus ; 

 coxis jiosterioribus mmus crebre subobsolete punctatis. Long. 4, lat. 2 m.m. 



I have seen but one or two specimens in bad condition of this species. 



North America, (Unalaschka). 364. 



594. Hydroporus jiyrenseus, Wehncke, Berl. Zeit. XV, ]). 1G3. — Oblongo-ovalis, 

 minus pubescens, nitidus, subtus nigricans, supra paulo dilutiur, pedibus rufo- 

 obscuris, antennis fuscis basi rufo ; prothorace angulis posterioribus obtusis, disco 

 Isevi, limbo minus distincte punctato ; elytris parcius sat fortiter punctatis, coxis 

 posterioribus parce minus fortiter punctatis. Long. 3i, lat. It m.m. 



This species is closely allied to Hydroporus morio (No. 598), but is rather 

 nari'Qwer and more elongate, more shining, and with the thoracic j^unctuation 

 considerably less. 1 think the type sent me by Herr Wehncke is a male, the tarsi 

 are not quite so broad as in Hydroporus morio, and the claws of the front ones are 

 not dentate, but slightly elongate. 



Europe : (Pyrenees). 362. 



