On Aquatic Carnivorous Coleoptera or Dytiscida. 591 
comparatively small space along the middle smooth ; this smooth space reaches 
however completely to the base: the strize of the elytra are rather fine, the sutural 
one is rather distant from the suture and becomes very fine in its basal portion and 
indced altogether obliterated near the base; between the ninth and tenth strie 
may be seen the rudiments of another stria. Ihave seen only the type specimen 
from Cheyrolat’s collection, which is a mutilated female; but I have received from 
Herr Wehncke two individuals which may probably be the males of C- distinctus ; 
the scratches on the thorax are absent but its surface is finely and sparingly punctured; 
the strise of the elytra are not so fine, and the size is rather larger; they have the 
front and middle tarsi moderately dilated, and the front tibize nearly simple. 
Mexico, (Coll. Brussels Mus.). 632. 
883. Copelatus ccelatipennis, Aubé, M.C.—Ovalis, subdepressus, angustulus, 
nitidus, fuscescens, capite, thoracis lateribus elytrorumque basi, antennis pedibusque 
rufis; prothorace strigis minutissimis subtilissimisque ; elytris striis sat profundis ad 
apicem fere continuatis, marginalique minus abbreviata ; corpore subtus rufescente, 
abdomine obscuriore. Long. 42, lat. 24 m.m. 
The male has the front and middle tarsi dilated, but not broad, and the front 
tibiee are bent at the base, and have a notch below the knee: the female differs 
only in the structure of the legs, the sculpture being quite similar in the two sexes. 
Brazil, (Santa Rita, Aug. Sepr., 1850, Sahlberg ; Espirito Santo). 630, 
884. Copelatus buqueti, Aubé, M.C.—Ovalis, subdepressus, piceo-niger, capite, 
thoracis lateribus elytrorumque basi extremo (hoc minus distincte) rufescentibus, 
antennis pedibusque rufis, tiblis tarsisque posterioribus piceis; prothorace strigis 
sat numerosis sed haud rudis, basi leevigato; elytris strus profundis, ad apicem fere 
continuatis, marginali anterius valde abbreviata. Long. 6, lat. 3§ m.m. 
This species is smaller than Copelatus sulcatus, (No. 886) and has the sculpture 
of the thorax less developed ; the strize of the elytra though deep and broad do not 
form such distinct grooves, and the elytra are indistinctly reddish at the base. 
The male has the front and middle tarsi but little dilated: and the female seems to 
differ from it only by the simple tarsi. 
South America, (Cayenne; Columbia). 629. 
885. Copelatus exaratus, n. sp.—Oblongo-ovalis, subdepressus, piceo-niger, 
nitidus, capite thoraceque versus latera dilutioribus, antennis pedibusque rufis, tarsis 
posterioribus piceis ; prothorace erebre profundeque strigoso ; elytris singulo striis 
decem per-profundis, ad apicem fere continuatis, aliaque ad marginem exteriorem 
anterius valde abbreviata. Long. 63, lat. 32 m.m. 
