594 On Aquatic Carnivorous Coleoptera or Dytiscide. 
smooth thorax, with short linear punctures near the margins are also prominent 
characters. 
South America, (Cayenne), 631. 
892. Copelatus striatopterus, Aubé, M.C.—Oblongo-ovalis, subdepressus, piceo- 
niger, nitidus, prothorace versus latera dilutiore, pedibus rufis, prothorace strigis 
impressis brevibus et parcis ; elytris striis undecim profundis sed angustis, alternis 
ad apicem evidenter abbreviatis (suturali dimidiata), striaque duodecima externa 
anterius haud abbreviata. Long. 6, lat. 3 m.m. 
The strize 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 tibize are curved at the knee, and 
have a slight notch near the base, and the front and middle tarsi are a little 
dilated. 
South America, (Brazil, Sahlberg). 627. 
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. 44, lat. 
23 m.m. 
The male has the prothoracie 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 fect is thickened in a peculiar manner; the front tibe are simple. In 
this species the first stria is equidistant from the suture and the second stria. 
IT have named this very distinct species in honour of M. Réné Oberthur, to whose 
kindness I owe three individuals. 
South America, (Bragance near Para; de Mathan). 708. 
S94. Colymbetes strigipennis, Cast. Kt. Ent. p. 103.—Ovalis, subdepressus, niger, 
prothorace ad latera, antennis pedibusque anterioribus rufis, posterioribus piceis; 
prothorace crebre profundeque strigoso ; elytris singulo striis undecim basi (etiam 
internis) perprofundis, ad apicem fere continuatis, aliaque ad marginem exteriorem 
anterius abbreviata. Long. 83, lat. 44 m.m. 
This species is usually mixed with the preceding in collections, but the 
present one is smaller, and has the internal striee of the elytra deeper at the base, 
