On Aquatic Carnivorous Coleoptera or Dytiside. 557 
794. Ilybius limbatus, n. sp.—Minor, ovalis, sat convexus, subnitidus, testaceus, 
supra eneus, capite thoraceque plus minusve pallescentibus, elytris margine lato 
testaceo ad apicem obsoletescente, dense punctato-reticulatis ; coxis posterioribus 
fere esculpturatis, margine anteriore extus abrupte deflexo; prosterni proccssu 
apice brevi. Long. 8, lat. 44 m.m. 
The male has the middle tarsi with the basal joints a little incrassate, and 
furnished beneath with moderately long hairs bearing minute paleties ; on the hind 
feet the outer claw is considerably shorter than the inner one and has an acuminate 
extremity ; the apical ventral segment bears no carina, and has the hind margin 
somewhat obsoletely rugose: the only individual | have seen of this sex has lost 
its front feet. ‘The female has the last ventral segment almost simple. 
Eastern Siberia. 854. 
Group 2. 
795. Ilybius discedens, n. sp.—Ovalis, angustulus, sat convexus, sat nitidus, 
niger, antennis pedibusque anterioribus rufis, pedibus posterioribus piceis ; elytris 
ad basin densius parum perspicue punctato-reticulatis, ad apicem punctulatis, 
punctis subseriatis conspicuis ; coxis posterioribus fere leevigatis; prosterni processu 
sat elongato; tarsis posterioribus articulis tantum breviter lobatis. Long. 73-84 
m.m. lat. 4—4$ m.m. 
The male has the front and middle tarsi almost simple and unincrassate; the 
claws of the front feet are rather short, equal in length, the anterior rather 
dilated, with its lower edge nearly straight, the hinder one rather more slender, 
and with its basal portion distinctly emarginate beneath. The apical ventral seg- 
ment has its hinder part thin in the middle and smooth, but with some coarse striz 
on each side, its hind margin truncate or rather emarginate-truncate : in the female 
this segment has a strong very short plica, and the appearance of a deep narrow 
notch at its apex. The claws of the hind feet are nearly similar in the two sexes, 
they are comparatively little unequal, still the outer is a good deal shorter than 
the inner, they are both rather slender and acuminate, and the outer one has its 
apex more curved than the other has, this is especially conspicuous in the female, 
the apical portion of the outer claw being in it strongly curved. 
The species is scarcely so large as I. guttiger, to which it has at first sight a 
resemblance: indeed superficially it suggests itself as a connecting link between 
Agabus and the smaller black Tlybii; it has a lateral and an apical yellow mark on 
each wing case; the hind coxe are not very large, and yet their front border is not 
very widely separated trom the middle coxe. The swimming legs are feeble (for 
its genns) and the group of sctw on the femoral angle is very ill developed. 
North America, (Hudson’s Bay). 930. 
4C2 
