594 On Aquatic Carnivorous Coleoptera or DytiscidoB. 



smooth tliorax, with short Hnear punctures near the marghis are also prominent 

 characters. 



South America, (Cayenne). 631. 



S92. Copelatus striatoptcrus, Aube, M.C. — Oblongo-ovahs, subdepressus, piceo- 

 niger, nitidus, prothorace versus latera dilutiore, pedibus rufis, prothoracc strigis 

 irapressis brevibus et parcis ; elytris striis undecim profundis sed. angustis, alternis 

 ad apicem evidenter abbreviatis (suturali diniidiata), striaque duodecima externa 

 anterius baud abbreviata. Long. 6, lat. 3 m.m. 



The strise of the elytra are regular and distinct in this species, but are not grooves, 

 the sutural one scarcely reaches half way to the apex, while on the other hand the 

 stria close to the side margin extends from the shoulder to near the extremity; 

 the hind legs are slender. In the male the front tibiae are curved at the knee, and 

 have a sliorht notch near the base, and the front and middle tarsi are a little 

 dilated. 



South America, (BrazO, Sahlberg). G27. 



893. Copelatus oberthuri, n. sp. — Ovalis, sub-depressus, nitidus, subtus testaceus, 

 supra infuscatus, prothoracis lateribus, elytrorum basi et apice dilutioribus ; 

 prothorace strigis impressis sparsis; elytris striis undecim profundis ad summum 

 basin attingentibus, alternis ante apicem magis abbreviatis, (suturali quam ceteris 

 vix breviore), striaque duodecima externa anterius abbreviata. Long. 4|, lat. 

 2\ m.m. 



The male has the prothoracic scratches more scanty than the female, and has the 

 basal joints of the front and middle tarsi a good deal dilated, and the claw joint of 

 the front feet is thickened in a peculiar manner ; the front tibaj are simple. In 

 this species the first stria is equidistant from the suture and the second stria. 



T have named this very distinct species in honour of M. Rdne Oberthur, to whose 

 kindness I owe three individuals. 



South America, (Bragance near Para ; de Mathan). 708. 



S94. Colymbetes strigipennis. Cast. Et. Ent. p. 103. — Ovalis, subdepressus, niger, 

 prothorace ad latera, antennis pedibusque antcrioribus rufis, posterioribus piceis ; 

 prothoracc crebre j^rofundeque strigoso ; elytris singulo striis undecim basi (etiam 

 internis) perprofundis, ad apicem fere continuatis, aliaque ad mavginem exteriorem 

 anterius abbreviata. Long. 8s, lat. 4| m.m. 



This species is usually mixed with the preceding in collections, but the 

 present one is smaller, and has the internal strise of the elytra deeper at the base, 



