592 On Aquatic Carnivorous Coleoptera or Dytiscide. 
As in Copelatus sulcatus, the striee are very deep so as to form grooves in their 
anterior part; the present species is however more elongate and parallel, and the 
striee of the elytra do not commence at the base quite so close to the front part; the 
antennee 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, antennis pedibusque rufis, tibiis tarsisque posteriori- 
bus piceis; prothorace crebre profundeque strigoso, basi utrinque ad angulos 
posteriores levigato ; elytris singulo striis decem ad basin (etiam internis) per- 
profundis, ad apicem fere continuatis, aliaque ad marginem exteriorem anterius 
valde abbreviata. Long. 6%, lat 34 m.m. 
This species is much smaller than Colymbetes strigipennis, (No. 894), but like it 
has all the strize 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, found by Bates, 626. 
Group 13. (Nos. 887 to 895). 
Elytra with a subimarginal stria, and with eleven other striz, 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 striz would at their terminations be similar to those of 
group 12. 
887. Copelatus badeni(Wehncke), n. sp.—¢ Oblongo-ovalis, sat depressus, nitidus, 
castaneus, (plus minusve infuscatus?) antennis pedibusque rufo-testaceis; capite 
inter oculos serie transversa strigulorum paucorum ; prothorace fere undique strigulis 
sparsis et profundis; elytris striis undecim profundis et fere integris, aliaque 
marginali abbreviata. Long. 63, lat. 33 m.m. 
The male has the front and middle tarsi greatly dilated; and the front tibize 
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. 
