On Aquatic Carnivorous Coleoptera ov Dytiscide. 575 
prothorax is finely punctulate, with a few fine, very short scratches near the sides. 
There are two forms of the female, in one of them the thorax and the whole of the 
elytra, except the apices, are densely covered with fine anastomosing striee; while 
the second form only differs from the male by the simple tarsi, and by the fact 
that the fine short scratches on the sides of the thorax have a rather greater 
extension towards the middle. The species is extremely closely allied to Copelatus 
neglectus (No. 841), but is less elongate in shape, has the scratches of the thorax 
in the second form of the female much less developed ; and has the elytral strize 
finer, with the alternate ones more abbreviate behind, so that indeed the sixth and 
especially the eighth are more or less reduced ; this character is however variable, 
for in some individuals, the sixth and eighth strize are nearly entirely absent, while 
in others they are but little shorter than the fourth. I have seen of the male only 
a single very mutilated example. 
South America, (Pampas, Germain). 642. 
841. Copelatus neglectus, n. sp.—Oblongo-ovalis, angustulus, elongatus, nigricans, 
capite, prothoracis lateribus elytrorumque basi et apice rufis, antennis pedibusque 
testaceis; prothorace in mare fere levigato, versus latera indistincte punctato, in 
femina dense striguloso ; elytris striis decem sat subtilibus, alternis brevioribus. 
Long. 5%, lat. 2% m.m. 
. The male has the front and middle tarsi rather broadly dilated, and the front 
tibice nearly simple. There are two forms of the female, in one of them the thorax 
and the whole of the elytra, except the apices, are densely covered with fine 
anastomosing strize, while in the second form there is no trace of such a sculpture 
to be detected, in this latter form the scratches on the thorax are not so dense and 
distinct as in the first. 
South America. (Venezuela, Cumana), 641. 
842. Copelatus concolor, n. sp.—Ovalis, sub-depressus, sat latus, nitidus, castaneo- 
testaceus ; prothorace levigato ; elytris striis decem subtilibus, alternis brevioribus. 
Long. 6, lat 3 m.m. 
In the male the front and middle tarsi are moderately dilated ; the front tibiee 
are stout and simple. In the female there are some very fine scratches at the sides 
of the thorax, and some more distinct ones on the external parts of the elytra a 
little in front of the middle ; in one of the females these scratches on the elytra are 
very much diminished. 
South America, (Amazonia, Pebas, Rio Purus, 25. 10. 1874, Dr. Trail). 640. 
