On Aquatic Carnivorous Coleoptera or Dytiscide. 569 
apiceque pallidis, abdomine pectoreque rufescentibus; elytris seriebus tribus sub- 
tilibus punctorum. Long. 5, lat. 24 m.m. 
The male has the front and middle tarsi a good deal dilated, and its front tibize 
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. 658. 
824. Copelatus inornatus, n. sp.—Ovalis, latiusculus, subdepressus, nitidulus, 
levis, niger, prothorace versus angulos anteriores piceo, antennis pedibusque rufo- 
testaceis; elytris seriebus tribus punctorum subtilissimorum. Long. 7, lat. 33 m.m. 
The male has the front and middle tarsi moderately dilated, and the front tibix 
supple. 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 species. 
South America? I am not at all sure that this locality will prove to be the correct habitat for this 
distinct species. 682. 
825. Dytiscus agilis, Fab., Liopterus agilis, M.C.—Sub-oblongus, minus depres- 
sus, sat nitidus, castaneus,capite infra utrinque, abdomine pectoreque nigris, antennis 
pedibusque rufis; capite fortiter punctato, anterius sublevigato; thorace maris 
subtiliter punctulato, feminze 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. 7, lat. 3} m.m. 
Besides the difference in the sculpture of the thorax there is also a slight but 
positive sexual difference 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 tibize are simple. ‘Ihe 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. 34 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 cach wing-case towards the 
