On Aquatic Carnivorous Coleoptera or Dytiscidce. 521 



Group 14. 



Hind coxEe large, ivith acutely arched upper border ; wings of the metasternum very 

 slender ; prosternal process rather small ; swimming legs ratlaer slender ; male front 

 tarsi but little incrassate. 



Two European species. 



726. Dytiscus femoralis, Payk., Agabus femoralis, M.C. — Ovalis, minus convexus, 

 niger, nitidus, supra aenescens, capite anterius, prothoracis elytrorumque lateribus 

 rufescentibus, antennis pedibusque rufis ; elytris subobsolete reticulatis, sed evidenter 

 punctulatis ; protborace margine laterali lato. Long. 6, lat. oh m.m. 



In the male the basal joints of the front and middle tarsi are slightly thickened, 

 and furnished beneath with moderately long glandular hairs, the claws of the front 

 feet are elongate, and nearly straight and simple ; in this sex the front femora are 

 fringed beneath with dense long cilise : there is no sexual disparity of sculpture. 



Northern Europe ; (Sweden ; Finland to 68° 30' according to Sahlberg ; Britain, Fi-ance, Belgium, 

 Germany). 758. 



727. Dytiscus abbreviatus. Fab., Agahus abhreviatus, M.C. — Ovalis, sat convexus, 

 sat nitidus, subtus rufescens, plus minusve picescens, supra aenescens, capite 

 prothoracisque lateribus ferrugineis, elytris fascia transversa subbasali undulata, 

 macula flammulata pone medium versus latera, alteraque apicali parvula, rotundata 

 testaceis, antennis pedibusque rufis ; elytris densis?ime vix perspicue reticulatis 

 subtilissimeque punctulatis. Long. 7*-, lat. 4 m.m. 



The male has the three basal joints of the front and middle tarsi a little 

 incrassate, and furnished beneath with rather long hairs, which bear small palettes 

 at their apex, the claws scarcely differ from those of the female. The species is 

 easily distinguished amongst its allies by the pale transverse fascia near the base 

 of the elytra ; the external portion of the elytra towards the base is also more or 

 less pale. 



Central Europe ; (Sweden, England, Germany, Belgium, France). 770. 



Group 15. 



Sides of thorax very finely margined, not at all curved ; prosternal process very 

 flat, not visibly margined ; metasternal groove rather elongate ; wings of metaster- 

 num large ; front border of hind coxa3 little arched ; swimming legs feeble, and 

 elongate ; male front tarsi with the basal joints but little incrassate, the fifth joint 

 angularly dilated in the middle beneath; claws elongate. 



A single North European species. 



