071 Aquatic Carnivorous Coleoptera or Dytiscidce. 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 Colyrabetes stagninus by the smaller 

 size and more convex form, and by the more arched anterior border of the hind 

 coxae 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. seniivittatus 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 Bhiff, East Florida, Forster). 786. 



691. Agabus texanus, n. sp. — Ovalis, sat convexus, nitidus, niger, antennis rufis, 

 pedibus piceis, elytris ante apiccm vitta sublaterali, elongata, testacea, plus minusve 

 distincta ; elytris sublsevigatis ; 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 haii's, 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. 



Group 6. 



Thorax and elytra very coadapted and continuous in outline ; prosterual process 

 rather narrow, very little dilated behind the coxae, polished, gently convex trans- 

 versely, not at all compressed, very finely margined throughout ; hind coxee 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. 



