On Aquatic Carnivorous Colcoptcra or Di/tistuhr. 397 



386. Dytiscus versicolor, Schall. Act. Hal. S13, Hydroporus reticulatus, M.C. — 

 Breviter ovalis, convexus, sat nitidus, sine pubescentia, ferrugineus, elytris vittis 

 interruptis nigris ; creberrime subtilissime punctatus, elytris punctis majoribus 

 adspersis ; processu prosternali antice acute elevato. Long. Si, lat. 2 m.m. 



The black marks on the elytra of this species consist of interrupted lines, and 

 vary greatly in their extent. I do not see any sexual distinctions. 



Northern and Middle Europe : ascends, according to Sahlberg, to 65° 55'. 181. 



387. Hyphydrus quinquelineatus, Zett., Hydroporus quinquelineatus, M.C. — 

 Breviter ovalis, convexus, nitidus, sine pubescentia, ferrugineus elytris lineis 

 elongatis nigris ; prothorace parce subtiliter punctato, elytris sat crebre et fortiter 

 punctatis, punctis minutis inter majores adspersis ; processu prosternali antice 

 depresso. Long. 3, lat. vix 2 m.m. 



Europe; Lapland, South Scothxnd, South Ireland, Belgium, Alsace, (Kasan, Wehnckc). Ascends to 

 68° 30', according to Sahlberg. 182. 



388. Hyphydrus decoratus, Gyll., Hydroporus decoratus, M.C. — Brevis, ovalis, 

 latus, convexus, sine pubescentia, nitidus, piceo-ferrugineu«, el3^tris obscurioribus, 

 lateribus maculisque indistincte rufescentibus ; elytris minus crebre sat fortiter 

 punctatis, j^unctiscjue minoribus inter majores adspersis. Long. 2a, lat. li m.m. 



INIiddlo Europe, (South S\vedcn, England, Germany, France). Not a common species. 184. 



389. Hydroporus acaroides, Lee, M.C. — Subrotundatus, subtus convexus, sine 

 pubescentia, ferrugineus, pectore abdomineque jilus minusve infuscatis (vel etiani 

 nigris), elytris nigro-signatis ; elytris dense fere subtiliter punctatis, versus latera 

 plicula elevata abbreviata ; pectore dense fortiter punctato, abdomine baud punctato 

 sed alutaceo, opaco. Long. 2s, lat. if m.m. 



The colour in this species appears to be variable, especially on the ventral 

 segments ; the species may be readily distinguished amongst its allies by the elytral 

 fold, and the peculiar sculpture of the ventral segments. The tarsi of the male 

 though not broad are distinctly dilated ; the female I am unacquainted with. 



North America, (Western States). 178. 



Group 2, 



390. Hydroporus musicus, Klug, M.C. — Breviter ovalis, convexus, nitidus, sine 

 pubescentia, ferrugineus, elytris lineis plus minusve interruptis nigris, prothorace 

 crebre evidenter punctato, elytris crebre fortiter fere sequaliter punctatis. Long. 

 3l, lat. 2\ m.m. 



