On Aquatic Carnivorous Coleoptera or Dytiscide. 341 
232. Desmopachria varians, Wehncke, Stet. Zeit. 1877, p. 151.—Brevis, lata, 
subrotundata, convexa, testacea, prothorace basi medio elytrisque nigro-signatis ; 
crebre fortiter punctata, elytris stria suturali impressa. Long. 22, lat. 1¢ m.m. 
Closely allied to Desmopachria suturalis (No. 229), but smaller and differently 
coloured ; the ground colour is yellow, and the base of the thorax is black, and 
the elytra are marked along the suture with black, and external to this have some 
large confluent, longitudinal black marks. This insect at first sight bears a good 
deal of resemblance to Dytiscus inaequalis, (No. 381), but itis broader and rather 
less convex, more finely punctured, and has the antennze shorter and finer. 
Brazil, (Bahia). 57. 
933. Desmopachria levis, n. sp.—-Brevis, lata, subrotundata, pernitida, im- 
punctata, castaneo-testacea, pectore abdomineque nigris. Long. 15, lat. 1s m.m. 
The head is very broad and short, very gently rounded in front, and very finely 
margined. The thorax is slightly sinuate on each side near the hind angles, and 
is quite impunctate. The elytra are also impunctate, as is the under surface. 
Although this species is excessively similar to Desmopachria nitida (No. 236), 
and allies, it is readily distinguished by the dark colour of the under surface, and 
the polished, shining, almost absolutely impunctate upper surface. 
In this species the prosternal process takes two different forms ; in one it is 
similar to that of Desmopachria nitida, viz., it consists of an anterior part, formed 
by two raised margins joined to form an acute angle in front, and a posterior part 
which projects from between these as an acute point; in the other it is a bifid or 
fureate process; the change is effected by the diminution of the central and 
posterior portion, the greater elevation of the raised sides of the anterior portion 
and their not being joined in front; the character is I have little doubt truly a 
sexual one. 
Brazil, (Santa Rita, August 1850, Sahlberg). 59. 
234, Desmopachria subtilis, n. sp.—Brevis, lata, subrotundata, sat convexa, 
ferruginea, sat crebre et fortiter punctata, prothorace basi utrinque leviter 
sinuato. Long. fere 2 m.m., lat. 1s mm. 
Very closely allied to Desmopachria ovalis, (No. 230), but a good deal smaller 
and with the punctuation more distant and rather finer: the form of the prosternal 
process is the same in both species, but I can scarcely think these two forms will 
prove to be but one species. 
This is one of two species confounded by Aubé and described as one species 
under the name of Hydroporus convexus. 
Brazil, (Campos). 54. 
