574 On Aquatic Carnivorous Coleoptera or Dytiscide, 
838. Copelatus ineequalis (Chev.), n. sp.—Ovalis, subdepressus, nitidus, fusco- 
castaneus, capite prothoracisque lateribus dilutioribus, antennis pedibusque testaceis; 
prothorace leevigato; elytris striis quinque eclongatis, (prima a sutura remota), cum 
tribus brevioribus alternantibus. Long. 6, lat. 3 m.m. 
In this species the Ist, 3rd, and 8th strize are elongate, and reach to within a 
short distance of the extremity, the 2nd, 4th, and Gth are in the male very short, 
existing only on the basal third or fourth of the length of the elytra, while in the 
female they extend to about half its length; the 7th stria in each sex extends 
rather more than half way to the extremity. The male has the front and middle 
tarsi moderately dilated, the front tibize simple, and the thorax without sculpture ; 
in the female the sides of the thorax bear some exceedingly fine, short, and almost 
obsolete scratches. 
South America, (Columbia). 646. 
839. Copelatus mundus, n. sp.—Robustus, ovalis, latus, subdepressus, nitidus, 
niger, capite, prothoracis lateribus elytrorumque basi rufis, his apice utrinque 
testaceo ; prothorace femine ad latera latius dense subtiliterque striguloso ; elytris 
striis octo, prima a sutura remota, alternis multo brevioribus. Long. 7¢ lat. 
4 m.m. 
I have seen but one individual which is a female, and has the sides of the thorax 
with dense fine scratches, and has besides a very few shorter and coarser scratches 
distributed over its surface: and the three or four external interstices of the elytra» 
have in front of the middle some tine anastomosing scratches. 
Mexico, (Brussels Mus. from Chevrolat’s collection). 648. 
Group 5. (Nos. 840 to 845). 
Elytra without submarginal stria, but with ten other strize on each wing-case. 
In all the species of this group the striz are elongate and regular, and well 
developed. 
640. Copelatus consors, n. sp.—Oblongo-ovalis, sat angustus, piceus, capite, 
prothoracis elytrorumque lateribus rufis, his apice dilutiore, antennis pedibusque 
testaceis ; prothorace vel subtiliter punctato et versus latera vix conspicue striguloso, 
vel dense striguloso; elytris striis decem subtilibus, alternis (preesertim octavo) 
multo brevioribus. Long. 5, lat. 22 m.m. 
In the male the front and middle tarsi are rather strongly dilated, and the 
