On Aquatic Carnivorous Coleoptera or Dytiscida. 505 
front feet are rather short, the anterior is rather stout and is abruptly bent, 
and is furnished with a very large basal lobe, the hind claw is stout and without 
noticeable lobe ; the middle tarsi have the apical joints a little elongated. The female 
is unknown to me. . 
The species is readily distinguished from Colymbetes stagninus by the smaller 
size and more convex form, and by the more arched anterior border of the hind 
coxe causing the side wing of the metasternum to be much more linear, as well as 
by numerous other differences. 
The mutilated ¢ individual sent me by Dr. Leconte as A. semivittatus is either 
this species or a closely allied one; the tarsi are mutilated so that I cannot say 
whether they agree with those of the individual I have described or not. 
North America, (St. John’s Bluff, East Florida, Forster), 786. 
691. Agabus texanus, n. sp.—Ovalis, sat convexus, nitidus, niger, antennis rufis, 
pedibus piceis, elytris ante apicem vitta sublaterali, elongata, testacea, plus minusve 
distincta ; elytris subleevigatis ; prothorace magno. Long. 8, lat. 5 m.m. 
The male has the front and middle tarsi a little incrassate, and with a narrow 
space furnished beneath with rather short hairs, which bear minute palettes; the 
claws of the front feet are not long, and the anterior one bears beneath a rather 
small projection a little before the base ; the apical joints of the middle tarsi are 
slightly elongate. 
The sculpture of the elytra in this species is extremely indistinct, nevertheless 
there is a minute sexual distinction in this respect, the female being seen on a very 
careful examination to be just visibly less smooth than the male. 
The male may be readily distinguished from that sex of A. semivittatus by the 
less developed tarsi and different anterior claws, as well as by other slight characters. 
North America, (Texas, Dallas). 787. 
Grovr 6. 
Thorax and elytra very coadapted and continuous in outline ; prosternal process 
rather narrow, very little dilated behind the cox, polished, gently convex trans- 
versely, not at all compressed, very finely margined throughout; hind coxz well 
developed, wings of metasternum short ; hind femora with well developed lamina 
at postero-external angle. Sexual disparities remarkable on legs, but wanting as 
to sculpture. 
Two New World species. 
