On Aquatic Carnivorous Coleoptera or Dytiscide. 567 
817. Copelatus melanarius, n. sp.—Oblongo-ovalis, haud parallelus, niger, capite 
anterius prothoraceque ad latera rufescentibus, antennis pedibusque rufis; thorace 
ad latera latius subtilissime striguloso-punctato; elytris seriebus punctorum distinctis, 
in mare fere sine strigulis, in femina ad latera strigulis subtilissimis densis plus 
minusve extensis ; coxis posterioribus crebre subtiliter strigulosis. Long. 9, lat. 
Az m.m. 
The male has the front and middle tarsi dilated ; and the anterior claw of the 
front foot is slightly thickened and bisinuate beneath, the apical portion being more 
slender than the rest : in the female there are on the sides of the elytra near the 
middle some very dense and fine scratches which are variable in their extent. 
The species varies somewhat in size and sculpture; there are sometimes a few 
scratches in the male on the basal portion of the elytra between the first, second, 
and third series of punctures. In a small narrow variety from Clarence River, the 
elytra of the female are covered with the dense fine scratches over a great extent, 
only the apex and a narrow space along the suture being free from them. 
Australia, (Clarence River). 670. 
818, Copelatus nigritulus, n. sp.—Oblongo-ovalis, minus depressus, niger, nitidus, 
capite anterius prothoraceque ad latera rufescentibus, antennis pedibusque rufis ; 
prothorace strigulis brevibus sparsis conspicuis ; elytris seriebus punctorum minus 
distinctis, strigulis brevibus, minus subtilibus, sat numerosis, ad apicem omnino 
desinentibus ; coxis posterioribus strigulis crebribus profundis. Long. 8%, lat. 
4 m.m. 
The male has the front and middle tarsi dilated, and the anterior claw of the front 
feet stouter but with a slender terminal portion. In the female the scratches on 
the elytra are slightly finer than in the male, and in some specimens their number 
is increased. 
‘The specimens before me show a great deal of variation especially as to the de- 
velopment and extent of the sculpture of the upper surface. The above diagnosis 
represents the majority of individuals, but certain forms have quite as extensive a 
development of the sculpture, as is found in C. acuductus. It is very probable 
that it may ultimately prove there is a series of closely allied species of this 
oroup. 
Australia, Tasmania. 671. 
819. Copelatus acuductus, Clk., M.C.—Oblongo-ovalis, minus depressus, elon- 
gatus, capite prothoraceque anterius versus latera picescentibus, antennis pedibusque 
“And ; prothorace strigulis brevibus conspicuis ; elytris fere sine seriebus punctorum, 
strigulis brevibus rudis numerosis, posterius subtilioribus, et longius versus apicem 
extensis. Long. 10, lat. 43 m.m. 
