On Aquatic Carnivorous Coleoptera or Dytiscide. 521 
Grovp 14, 
Hind coxze large, with acutely arched upper border ; wings of the metasternum very 
slender ; prosternal process rather small ; swimming legs rather slender ; male front 
tarsi but little incrassate. 
Two European species. 
726. Dytiscus femoralis, Payk., Agabus femoralis, M. C.—Ovalis, minus convexus, 
niger, nitidus, supra snescens, capite anterius, prothoracis elytrorumque lateribus 
rufescentibus, antennis pedibusque rufis ; elytris subobsolete reticulatis, sed evidenter 
punctulatis; prothorace margine laterali lato. Long. 6, lat. 3} 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 ciliz : there is no sexual disparity of sculpture. 
Northern Europe ; (Sweden; Finland to 68° 30/ according to Sahlberg; Britain, France, Belgium, 
Germany). 758. 
727. Dytiscus abbreviatus, Fab., Agabus abbreviatus, M.C_—Ovalis, sat convexus, 
sat nitidus, subtus rufescens, plus minusve picescens, supra senescens, capite 
prothoracisque lateribus ferrugineis, elytris fascia transversa subbasali undulata, 
macula flammulata pone medium versus latera, alteraque apicali parvula, rotundata 
testaceis, antennis pedibusque rufis; elytris densissime vix perspicue reticulatis 
subtilissimeque punctulatis. Long. 74, 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 cox 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. 
