476 On Aquatic Carnivorous Coleoptera or Dytiscidcs. 



Mas, subopacus, sat distincte punctatus, tarsis anterioribus et intermedils fortiter 

 dilatatis, illis unguiculis ingequalibus, anteriore crassiore et magis curvato. 



Fern., opaca subobsolete punctata. 



This species is extremely closely allied to Dytiscus palustris, but is rather larger, 

 and has the elytra less distinctly marked with yellow, and the disparity between 

 the sexes greater, the punctuation being more different in the two sexes, and the 

 male tarsi broader. It is I believe a subalpine species. 



Europe, (Pyrenees and Cantabrian mountains). 343. 



614. Dytiscus erythrocephalus, Linn., Hydroporus erythrocephalus, M.C. — Ovalis, 

 convexus, subnitidus, evidenter pubescens, nigricans, elytris fuscis basi lateribusque 

 dilutioribus, pedibus capiteque rufis, hoc fusco-notato, antennis rufo-fuscis, basi 

 rufo ; prothoracis limbo fortiter disco subtiliter punctato ; elytris coxisque poster 

 ioribus fortiter punctatis. Long. 4, lat. 2 mm. 



Afas, tarsis anterioribus et intermediis dilatatis. 

 Fem., tarsis anterioribus et intermediis angustulis. 

 Fern., var. ojoaca, obsolete punctata. 



The obsoletely punctured form of the female was considered a distinct species 

 by Aub^ and others, (II. deplanatus, Gyll.) 



Central and Nortliern Europe ; Siberia, (Sweden ; Finland, to 68° North, Sahlberg ; Britain ; France ; 

 Germany; Portugal, Van Volxem, this locality requires confirmation). 341. 



615. Dytiscus rufifrons, Duft., Hydroporus rufijrons, 2J.C. — ObJongo-ovalis, con- 

 vexus, subnitidus, j^arcius pubescens, nigricans, elytris fuscis basi stepe dilutiore, 

 antennis pedibusque rufis, illis versus apicem infuscatis, capite anterius rufescente ; 

 prothorace limbo fortiter disco subtiliter punctato ; elytris coxisque posterioribus 

 fortiter punctatis. Long. 5, lat. 2| m.m. 



Mas, tarsis anterioribus et intei-mediis leviter dilatatis. 



The male differs only from the female by the rather slight dilatation of the four 

 anterior feet. 



Northern Europe. (Sweden ; Finland, to G8° North, Sahlberg ; Scotland, England, Northern France, 

 Belgium, German}'). 340. 



GIG. Hydroporus rubripes, Sahl., Not. fenn. XIV, p. 151. — Oblongo-ovalis, sat 

 convexus, crebre evidenter punctatus, parcius tenuiter pubescens, sat nitidus, 

 nigricans, pedibus antennisque rufis, his versus apicem infuscatis ; prothorace angulis 

 posterioribus obtusis, disco Itevi limbo evidenter punctato ; cox is posterioribus parcius 

 subobsolete punctatis. Long, ih, lat. 2| m.m. 



I am acquainted with the male only of this species, it Las the front and middle 



