On Aquatic Carnivorous Coleoptera or Dytiscide. 653 
This species seems to vary but little ; the whole of the sutural area of the elytra 
is broadly and uninterruptedly black, the lateral margin is broadly yellow, but is 
marked especially towards the extremity with streaks of black dots. 
Northern and Central Europe, rather common; (Sweden, Germany, Northern France, Belgium, 
England). 1032. 
1013. Hydaticus piceus, Lec., M.C.—Robustus, convexus, sat latus, sericeo-opacus, 
subtus piceus, supra fere unicolor, brunneus, limbo dilutiore. Long. 13, lat. 7 m.m. 
On the front tarsi of the male the fringing hairs are well developed, and the pal- 
ettes are large, those at the base being distinctly larger than the others, the claws are 
abruptly bent at the base ; the middle tarsi are broadly dilated, and bear a dis- 
tinct basal patch of glandular pubescence, besides the large palettes. The female 
has on the front of the thorax at some distance from each side, two or three coarse 
irregular impressions. 
This species is peculiar on account of its colour. Although it appears at first 
sight almost unicolorous above, yet on examination 1t is seen that the vertex is 
darker, and that in front of it there is an obscure arcuate dark mark, the disc of the 
thorax is also vaguely dark, and by careful examination there may be seen obsolete 
black dots or irrorations on the wing-cases, especially on the base and near the 
sides. ‘he silky opacity of the upper surface is peculiar and characteristic of the 
species. IL have seen only a single pair. 
ry Co 
North America, (Pennsylvania, Illinois, sec. Crotch). 1018. 
1014. Hydaticus parallelus, Clk., M.C.—Hlongatus, subparallelus, haud_ latus, 
nitidissimus, subtus piceus, vel piceo-niger, supra rufus, capite posterius nigro- 
signato, prothorace in medio transversum nigricante, elytris creberrime nigro-irroratis, 
versus suturam fere omnino nigris, punctis seriatis conspicuis; antennis pedibusque 
anterioribus rufis, pedibus posterioribus piceis ; prothorace in medio canalicula brevi 
et tenui. Long. 14, lat. 7 m.m. 
This species is closely allied to Hydaticus capicola (No. 1043), but is more 
elongate and parallel in form, the distance between the anterior border of the hind 
coxa and the middle coxal cavity is rather greater, and the upper surface 1s appar- 
ently blacker and more shining, so that no traces of longitudinal lines of red colour can 
be perceived on the wing-cases. There are three series of black marks on the head, 
one in front of the other, these marks are connected at the sides, and occasionally 
in the middle also. The female has a few deep, coarse, short ruge on the 
thorax, on each side between the outer margin and the middle. 
Australia, (New South Wales). 1001. i 
4P% 
