On Aquatic Carnivorous Coleoptera or Dytiscide. A471 
598. Hydroporus morio, Dej., M.C.—Ovalis, parcius sed evidenter pubescens, 
niger, pedibus fuscis vel fusco-rufis, antennarum basi minus lete rufo ; prothorace 
anterius angustato, basi fortiter punctato, disco sub-elevato sparsim subtiliter 
punctato ; elytris parcius distincte punctatis ; coxis posterioribus sparsim minus 
profunde punctatis. Long. 38, lat 1; m.m. 
Mas, tarsis anterioribus et intermediis magis dilatatis, illis unguiculis majoribus, 
anteriore medio angulatim dilatato. 
Fem., (a.) wt im mare nitida. 
(b.) opaca. 
This species usually is represented in catalogues under the name of Hydroporus 
melanocephalus, Marsh., Steph.; but as the descriptions of the authors referred to 
almost certainly were not made from this species, it is better to adopt the name 
proposed: by Dejean and brought into general use in the Munich Catalogue. 
Europe ; Siberia ; North America. (Finland 69° north, Sahlberg ; Scotland ; Riesengebirge ; Pyrenees 
Schaum; White Mountains, New Hampshire). 308. 
599. Hydroporus gyllenhalli, Schiodte, Dan. El. p. 434.—Oblongo-ovalis, 
convexiusculus, nitidus, fere glaber, fortiter punctatus, castaneo-piceus, pectore 
abdomineque nigris, pedibus antennisque rufis; prothorace disco sat crebre 
evidenter punctato; coxis posterioribus sparsim evidenter punctatis. Long. 32, 
lat. 2 m.m. 
I can see no sexual distinctions in this species, all the specimens I have examined 
have the tarsi rather broad. 
Europe ; (Sweden, Finland, Scotiand, basin of the Seine, Reynosa, Cantabrian Mountains. ) 357. 
600. Hydroporus notatus, Sturm, M.C.—Oblongus, parcius punctatus et 
pubescens, subtus nigricans, pedibus rufis, antennis rufescentibus, basi rufo ; capite 
permagno, rufescente, medio fusco-umbroso ; thorace fusco-nigro lateribus rufescen- 
tibus, basi punctis sparsis, magnis, medio fere impunctato ; elytris fuscis, basi 
lateribusque vage rufescentibus, parcius minus fortiter punctatis ; coxis posterioribus 
fortiter punctatis, Long. 3, lat. 12 m.m. 
The male has the front and middle tarsi broader than in the female. The 
species is closely allied to Dytiscus tristis (No. 602), but no doubt distinct. 
Europe. (Germany, and Southern Scandinavia). 396. 
601. Hydroporus elongatulus, Sturm, M.C.—Oblongus, minus angustus, vix crebre 
pubescens, nigricans, pedibus rufis, antennis fusco-rufis, basi dilutiore, capite 
elytrisque rufo-fuscis, illo anterius dilutiore; prothorace basi fortiter punctato 
