570 On Aquatic Carnivorous Coleoptera or Dytiscide. 
humeral portion numerous excessively fine and short scratches, and similar marks 
may also be perceived on the sides of the prothorax. 
Algeria, Corsica. 826. 
827. Copelatus dimorphus, n. sp.—Oblongo-oyalis, minus parallelus et depressus, 
haud elongatus, nigricans, capite elytrorumque apice piccis, prothoracis lateribus 
antennis pedibusque rufis; elytris maris seriebus quatuor subtilibus punctorum, 
feminee striis subtilibus circiter decem plus minusve interruptis, alternis posterius 
longe abbreviatis. Long. 4%, lat. 22 m.m. 
The male has the front and middle tarsi a good deal dilated, and the front tibize 
thick, short and nearly simple, the thorax with very little sculpture, the elytra 
with about four series of fine elongate punctures, The female has rather numerous 
fine short strize on the lateral portions of the thorax, and on the elytra very fine 
strice which have a somewhat interrupted or subpunctate appearance, the first of 
them is remote from the suture and the alternate ones extend little more than half 
way to the apex, while the others reach within a short distance of the apex. This 
species has the prosternal process a good deal raised in the middle and very strongly 
margined at the sides. 
South America, (Parana). 659. 
Grovp 2. (Nos. 828 to 836). 
Elytra without submarginal stria, but with either three, four or five true striz on 
each wing case. 
Most of the species of this group are known to me only by one or two specimens, 
they are mostly of elongate parallel form. 
828. Copelatus longicornis, n. sp.—Oblongus, angustulus, subparallelus, nitidus, 
obsolete punctulatus, rufus, elytris magis castaneis, basi rufo, striis tribus, prima 
a sutura, tertia a margine laterali, zequaliter remotis. Long. 5, lat. 2; m.m. 
In this species there are three elongate strie on the elytra, the first of which is 
about as far from the suture as the outer one is from the lateral margin; the male 
has the front and middle tarsi much dilated; the front tibiz rather short and stout, 
a little bent and distinctly notched below the knee; the female differs only by the 
structure of the legs and feet. 
The species is perhaps a variable one, as females from Brazil and Pernambuco, 
differ from the Santa Rita specimens in size and colour. 
Brazil, (Santa Rita, Sepr., 1850, Sahlberg), 699. 
