On Aquatic Carnivorous Coleoptcra or Di/tiscida. 569 



apiceque pallidis, abdoinine pectoreque rufesceutibus ; elytvis seriebus tribns sub- 

 tilibus punctorum. Long. 5, lat. 2^ m.m. 



The male has the front and middle tarsi a good deal dilated, and its front tibite 

 are slender, with their upper part curved and on the inside broadly but little 

 deeply emarginate below the knee. The female is unknown to me. The smooth 

 surface, with not very distinct series of punctures on the elytra, after the manner 

 so common in Hydroporus, renders the species very easy to distinguish. 



Cuba, St. Domingo. Go8. 



824. Co2:)elatus inornatus, n. sp. — Ovalis, latiusculus, subdepressus, nitidulus, 

 laevis, niger, prothorace versus angulos anteriores piceo, antennis pedibusque rufo- 

 testaceis; elytris seriebus tribus punctorum subtilissimorum. Long. 7, lat. 3'8- m.m. 



The male has the front and middle tarsi moderately dilated, and the front tibia; 

 simple. I have not seen the other sex. The species seems allied to Copelatus 

 ater, (No. 814), but the upper surface is smooth, not punctulate as in that sj^ecies. 



South Aujerica ? I am uot at all sure that this locality will prove to be the correct habitat for this 

 <listinct species. 682. 



825. Dytiscus agilis. Fab., Lioptcrus agilis, M.C — Sub-oblongus, minus depres- 

 sus, sat nitidus, castaneus,capite infra utrinque, abdomine pectoreque nigris, antennis 

 pedibusque rufis ; capite fortiter punctato, anterius subltevigato ; thorace maris 

 subtiliter punctulato, feminse dense brevissime striguloso ; elytris in utroque sexu 

 dense brevissime striguloso, sed ad apicem punctato, seriebus punctorum sub-dis- 

 tinctis ; coxis posterioribus crebre conspicue strigulosis. Long. 7i, lat. 3l m.m. 



Besides the difference in the sculpture of the thorax there is also a slight but 

 positive sexual difierence in the sculpture of the basal part of the elytra; the male 

 moreover, is readily distinguished by the broadly dilated front and middle tarsi ; 

 its front tibia? are siniple. 1 he species seems subject to little or no variation. 



Europe ; (Sweden, Denmark, England, France, Corsica, Germany, Sarepta). 687. 



826. Copelatus atriceps, n. sp. — Oblongo-ovalis, minus depressus, nitidus, testaceo- 

 castaneus, capite plus minusve evidenter nigricante, prosterno in medio, abdomine 

 pectoreque nigris, antennis pedibusque testaceis; subtilissime punctulatus, elytris 

 seriebus punctorum subdistinctis; coxis posterioribus vix conspicue strigulosis. 

 Long. 7, lat. 31 m.m. 



The male has the front and middle tarsi broadly dilated, and the front tibice 

 simple; the anterior claw of the front foot is shorter than the other claw. The 

 female when carefully examined, is seen to have on each wing-case towards the 



