590 On Aquatic Carnivorous Coleoptera or DytiscidcB. 



stout, and are scai-cely bent at the knee, but are emarginate on the inner edge at 

 some distance below it. The female is without sexual sculpture. The species 

 seems to be variable in size, colour, and the depth of the strife on the elytra : some 

 specimens from Cuba have the scratches on the hind coxa3 elongate, while in the 

 mdividuals from the United States there are only short marks on that part. 



Copelatus punctulatus is referred as a synonym of this species on the authority of 

 Crotch. 



Umted States, (Massachusetts, Texas) ; Cuba ; Guadeloupe. 63.5. 



8S0. Copelatus advena, n. sp. — Ovalis, subdepressus, niger, nitidus, capite, 

 prothoracis lateribus angustius, antennis pedibusque rufis ; prothorace strigis bre- 

 vibus sparsis, disco fere lajvigato ; elytris striis minus profundis decem ad apicem 

 fere prolongatis, aliaque marginali anterius abbreviata ; corpore subtus piceo. Long. 

 6t, lat. Si m.m. 



In this species the thorax bears distinct, but short and distant stripe, which are 

 not wanting in the middle near the base, but are nearly absent from a space anterior 

 to this. In the male the front and middle tarsi are a little dilated, and the front 

 tibipe are curved and notched at the knee. The female is unknown. 



The habitat of this species is \mcertaiii, but it is probably South America. G34. 



881. Copelatus integer, n. sp. — Ovalis, subdepressus, nitidus, piceus, capite 

 dilutiore, prothorace ad latera, elytrorum basi, antennis pedibusque rufis; prothorace 

 strigis minus numerosis baud subtilibus ornato; elytris striis decem sat profundis, 

 ad apicem fere prolongatis, aliaque marginali anterius abbreviata. Long. 5^, lat. 

 2| m.m. 



The sculpture of the thorax consists of rather deep but distant scratches some of 

 which are long and others short, they extend all across the thorax, the base in front 

 of the scutellum being however more free from them than anywhere else. The 

 male has the front and middle tarsi distinctly dilated, and its front tibiae are rather 

 stout and simple, that is they are not curved or notched near the knee. 



Nicaragua, (Cliontales, Belt). G33. 



882. Copelatus distinctus, Aube, JI.C. — Fern., Oblongo-ovalis, subdepressus, angus- 

 tulus, piceus, prothoracis lateribus elytrorumque basi et lateribus ferriigineis, pedibus 

 rufis ; prothorace ad latera latius dense strigoso ; elytris striis decem subtilibus, 

 aliaque marginali anterius abbreviata ; stria suturali anterius desinente. Long 5, 

 lat. 2 1 m.m. 



The sculpture of the thorax in this species is veiy characteristic, the sides are 

 densely covered with fine scratches, which extend so f\ir inwards as to leave a 



