574 On Aquatic Carnivorous CoJeoptera or Dytiscidw, 



838. Copelatus inrequalis (Chev.), n. sp. — Ovalis, siibdepressus, nitidus, fusco- 

 ( astaneiis, capite protlioracisque lateribus diliitioribus, antennis pedibusque testaceis; 

 jirothorace lajvigato ; elytris striis quinquc eloiigatis, (prima a sutura reniota), cum 

 tribus brevioribus altcrnantibus. Long. G, lat. 3 m.m. 



In this species the 1st, 3rd, and 8th strife are elongate, and reach to witliiu a 

 short distance of the extremity, the 2nd, 4th, and Gth are in the male very short, 

 existing only ou 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 tibiae simple, and the thorax without sculpture ; 

 in the female the sides of the thorax bear some exceedingly fine, short, and almost 

 obsolete scratches. 



Si)utli America, (Coluiuljia). 040. 



839. Copelatus mundius, n. sp. — Kobustus, ovalis, latus, subdepressus, nitidus, 

 iiiger, capite, prothoracis lateribus elytrorumque basi rufis, his apice utrinque 

 testaceo ; prothorace feminoe ad latera latins dense subtiliterque striguloso ; elytris 

 striis octo, prima a sutura remota, alternis multo brevioribus. Long. 71 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 lino anastomosing scratches. 



Mexico, (Brussels Mus. from Ohevrolat's collection). G48. 



Group 5.(Nos. 840 to 845). 



Elytra without submarginal stria, but with ten other stnre on each wing-case. 

 In all the species of this group the striae are elongate and regular, and well 

 developed. 



G40. Copelatus censors, n. sp. — Oblongo-ovalis, sat angustus, piceus, capite, 

 prothoracis elytrorumque lateribus rufis, his apice dilutiore, antennis pedibusque 

 testa r-eis ; prothorace vel subtiliter punctato et versus latera vix conspicue striguloso, 

 vel dense striguloso ; elytris striis dccem subtilibus, alternis (pra?sertim octavo) 

 multo brevioribus. Long. 5, lat. 22 m.m. 



In the male the front and middle tarsi are rather strongly dilated, and the 



