576 Oji Aquatic C'lruicorous Co!e iptcia or Di/ttsciche. 



S43. Copelatusalternatus, n. sp. — Ovalis, subdejjressus, angustulus, iiitidus, piceiis, 

 capite, pi-othoracis lateribus elytrisque ca>;taneis, his basi diluiiore ; thorace strigulis 

 numerosis distinctis it- qualiter distribiitis ; elytris striis decern baud subtilibus, 

 alternis evidenter brevioribus. Lonw. G, lat. 2| m.m. 



In the male the front and middle tarsi ai'c moderately dilated, the front tibiae are 

 rather stout, and very indistinctly emarginate below the knee. In the female the 

 upper surface bears rather numerous very fine punctures which are not to be observed 

 in the male. The females show a good deal of variation in the prothoracic scratches, 

 these in the individuals from PetropoHs being finer and loss numerous than in the 

 specimens from other localities; I have seen but a single male and four females. 



South America, (Brazil). 039. 



844. Copelatus dupoiiti, Aube, M.C. — Ovalis, subdepressus, nitidus, subtus rufo- 

 piceus, supi'a rufescens, prothorace medio late nigricante, elytris lateribus fasciaque 

 lata transversa pone medium nigris ; prothorace strigulis parcis distinctis sed brevi- 

 bus ; elytris striis decern subtilibus, quarum secunda quam ceteris versus apicem 

 paulo brevior, antennis pedibusque rufis. Long. Gf, lat. Ss m.m. 



In this species the elytra are of an obscure yellowish or reddish colour, with a dark 

 mark extending along the side but not reaching the extremity, this mark is broader 

 near the shoulder, and beyond the middle is connected with a dark mark which 

 extends inwards but does not reach the suture. In the male the front and middle 

 tarsi are moderately dilated, tlie front tibiae are i-ather stout and simple. In the 

 female the sides of the thorax bear numerous dense fine stria», in addition to those 

 that are distributed over the rest of the surface. 



South America, (Cayenne, PetropoHs, Deer., 1850, R. F. Sahlberg.) 638. 



845. Copelatus bonvouloiri, n. sp. — Fern., Robustus, ovalis, sat latus et elougatus, 

 nitidus, niger, capite, prothoracis lateribus anguste, elytroj'um basi et apice, antennis 

 pedibusque rufis, corpore subtus piceo ; prothorace undique dense strigoso ; elytris 

 striis decern subtilibus, alternis (proesertim secunda) brevioribus. Long. 7, Int. 

 3| m.m. 



Readily distinguished amongst its allies by the very dense and distinct ocratches 

 on the thorax and by its large size : the red colour at the base of the elytra is not 

 extensive and therefore not very striking, on the other hand the yellowish apex 

 is very conspicuous. 1 have seen only a single specimen. 



South America, (Brazil, Sta, Catherina, coll. Bonvouloir.) G47. 



