586 On Aquatic Carnivorous Coleoptera or Dytiscrde. 
feminze -ad latera crebrius latiusque striguloso; elytris strus duabus suturalibus 
anterius longe desinentibus, octo subtilibus ad apice fere -prolongatis (alternis 
brevioribus), aliaque marginali anterius valde abbreviata. Long. 74, lat. 32 m.m, 
The male has the front and middle tarsi broadly dilated, and the front tibize 
simple, and the thorax almost without sculpture (except the marginal series): the 
female has the sides of the thorax covered over a rather broad space with fine but 
quite distinct scratches or strie. The species has the second stria from the suture 
indicated only by some small interrupted remnants, the first stria is less obliterated. 
I have seen only a single pair. 
Panama. 644. 
870. Copelatus nigricans, n. sp.—Robustus, ovalis, latus, nitidior, niger, capite 
piceo, prothorace lateribus anguste ferrugineis, elytris apice sordide testaceo, 
antennis pedibusque rufis, corpore subtus piceo; prothorace femine ad latera 
striguloso; elytris striis duabus suturalibus anterius longe desinentibus, octo ad 
apice fere prolongatis (alternis brevioribus), aliaque marginali anterius valde 
abbreviata. Long. 77, lat. 4 m.m. 
I have seen but one individual, which is a female; besides the scratches on the 
thorax there are numerous very distinct scratches on the sides of the elytra, not 
extending to the base or apex. The species is closely allied to Copelatus prolongatus 
but is much broader. 
South America, (New Granada, coll. de Bonvouloir). 645. 
871. Copelatus vigintistriatus, Fairm., Ann. Soe. Ent. Fr. 1869, p. 188.—Oblongo- 
ovalis, angustulus, sat depressus, piceus, capite thorace elytrorumque lateribus 
dilutioribus, antennis pedibusque rufis ; prothorace subleevigato, strigulis brevissimis 
per-paucis; elytris striis decem sat profundis, suturali anterius, alternis posterius, 
brevioribus, aliaque marginali brevissima. Lone. 54, lat. 27 m.m. 
I have seen only the female of this species. 
Madagascar. 702. 
872. Copelatus polystrigus, n. sp.—Ovalis, sat angustus, subdepressus, nitidus, 
nigropiceus, elytris vitta intra-laterali cum macula ante-apicali fere conjuncta 
testacea, prothoracis lateribus dilutioribus, antennis pedibusque rufis ; prothorace 
sublevigato, strigulis brevissimis per-paucis ; elytris striis decem profundis, alternis 
posterius brevioribus, aiiaque marginali valde abbreviata. Long. 6, lat. 3 m.m. 
I have seen only females of this species. The individuals from Senegal have a 
fascia of a red colour at the base of the elytra which is scarcely to be seen in 
