592 On Aquatic Cai'iiiivrous Coleoptera or Dytiscidce. 



As in Copelatus sulcatus, the strife are very deep so as to form grooves in their 

 anterior part ; the present species is however more elongate and parallel, and the 

 striae of the elytra do not commence at the base quite so close to the front part; the 

 antennae are considerably longer, and the male tarsi a little broader. 



South America, (Amazonia). 628. 



886. Copelatus sulcatus, n.sp. — Ovalis, subdepressus, piceo-niger, capile thoraceque 

 versus latera paulo dilutioribus, antennispedibusquerufis, tibiis tarsisquo posteriori- 

 bus piceis ; prothorace crebre jirofundeque strigoso, basi utrinque ad angulos 

 posteriores Isevigato ; elytris singulo striis decern ad basin (etiam internis) per- 

 l)rofundis, ad apicem fere continuatis, aliaque ad marginem exteriorem anterius 

 valde abbreviata. Long. Gl, lat 3i m.m. 



This species is much smaller than Colymbetes sirigipennis, (No. 894), but like it 

 has all the striae excessively deep at the base ; there is a stria less however in the 

 present species ; the one that in Col. strigipennis is the tenth and is more abbre- 

 viated posteriorly than the others is that wanting in the present species. The dila- 

 tation of the male tarsi is not great. 



Upper Amazons, foxmd by Bates. G26. 



Group 13. (Nos. SS7 to 895). 



Elytra with a submarginal stria, and with eleven other striae, on each. 



The extra stria possessed by this group in contrast to the preceding one seems 

 to be the tenth ; this is rather shorter than the others, and if it were supposed 

 absent, the other striae would at their terminations be similar to those of 

 group 12. 



887. Copelatus badeni(Wehncke), n. sp. — S Oblongo-ovalis, sat depressus, nitidus, 

 castaneus, (plus minusve infuscatus?) antennis pedibusque rufo-testaceis ; capite 

 inter oculos serie transversa strigulorum paucorum ; prothorace fore undiquc strigulis 

 sparsis et profundis; elytris striis undecim profundis et fere integris, aliaque 

 marginali abbreviata. Long. 6i, lat. 3j m.m. 



The male has the front and middle tarsi greatly dilated ; and the front tibiae 

 curved at the base and much emarginate on the inner edge near the knee. The 

 female I have not seen. 



The species to judge from a single individual is very closely allied to C. irregu- 

 laris (No. 890), but is differently coloured, and has a few short marks on the head. 



Fiji Islands. 686. 



