On Aquatic Carnivorous Coleoptera or Dytiscidce. 427 



The male has the front and middle tarsi broader than in the female, and the 

 claws of the front ones rather more developed, and its thorax is slightlv broader 

 and a little more curved at the sides. 



Southern Europe, Algeria, and the Canary Islands. (Andalusia, Blidah). 246. 



470. Deronectes amurensis, n. sp. — Oblongo-ovalis, omnium brevissime sub- 

 tilissimeque (vix visibiliter) pubescens, subopacus, rufo-testaceus, subtus nigricans ; 

 thorace anterius et posterius elytrisque lineis plurimis confluentibus subinterruptis 

 nigris ; elytris apicem versus denticulo minus conspicuo ; corpora dense sabtilissime 

 punctulato. Long. 4i, lat. "i m.m. 



In the male the front and middle tarsi are broad, and the unguiculi of the front 

 pair are moderately elongate and slightly thickened, and the interior (or anterior) 

 one is furnished near the base with an obtuse swelling or tooth. 



I have seen only a single male of this species, Avhich has the hind angles of the 

 thorax much less rounded than in the corresponding sex of Dytiscus depressus, (No. 

 472) ; the black lines more completely cover the elytra, and the undersurface is 

 black. Its larger size and broader form readily enough distinguish it from varieties 

 of Dytiscus assimilis, (No. 471), with dark undersurface. 



Siberia, (Irkutsk). 242. 



471. Dytiscus assimilis, Payk., Ilijdroporus assimilis, M.C — Oblongo-ovalis, 

 convexiusculus, subtilissime brevissimeque pubescens, fere opacus, testaceus, 

 prothorace basi (sed vix antice) elytrisque lineis baud interruptis nigris, corpore 

 subtus vel ferrugineo vel infuscato ; elytris apicem versus denticulo acuto ; 

 prothorace basi quam apice evidcnter latiore ; corpore dense subtilissime punctulato. 

 Long. 45, lat. 2\ m.m. 



The front tarsi are broad in both sexes, in the male slightl}' broader and distinctly 

 longer than iu the female, and with the claws elongate and comparatively stout, 

 and the interior one dilated towards the base ; the middle tarsi are broader in this 

 sex than in the female. 



Eurojie ; East Siberia. (Scotland, Alsatia, Nimes, Munich, Gastein). 24-3. 



472. Dytiscus depressus. Fab., Hydroporus depressus, M.C. — Obiongo-ovalis, 

 brevissime subtilissimeque pubescens, subopacus, testaceus, thorace anterius et 

 posterius nigricante, elytris lineis plus minusve confluentibus nigris, maculis 

 pallidis interruptis ornatis ; thorace lateribus rotundatis angulis posterioribus 

 per-obtusis {$), vel rotundatis P ; elytris apicem versus denticulo acuto; corpore 

 subtilissime punctulato, subtus suturis plus minusve uigro-ornatis. Long. 4i, lat. 

 2» m.m. 



T^IKS. ROr. DUB. SOC, N.3 , TOL. II. 3 K 



