On Aquatic Carnivorous Coleopiera or Dytiscidce. 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 (Jentral Europe, rather common ; (Sweden. Germany, Northern France, Belgium, 

 England). 10.3-2. 



1013. Hydaticus piceus, Lee, M.C. — Robustus, convexus, satlatus, 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 it 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 tlie wing-cases, especially on the base and near the 

 sides. The .silky opacity of the upper surface is peculiar and characteristic of the 

 species. I have seen only a single pair. 



North America, (Pennsylvania, Illinois, sec. Crotch). 1018. 



1014. Hydaticus parallelus, Clk., M.C. — -Elongatus, subparallelus, baud latus, 

 nitidissimus, subtus piceus, vel piceo-niger, supra rufus, capite posterius nigro- 

 signato, prothorace in medio transversim nigricante, el3'tris creberrime nigro-irroratis, 

 versus suturam fere omnino nigris, punctis seriatis conspicuis; antennis jiedibusque 

 anterioribus rufis, pedibus posterioribus piceis ; prothorace in medio canalicula brevi 

 et tenui. Lono^. 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 is 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 rugse on the 

 thorax, on each side between the outer mai'gin and the middle. 



Australia, (New South Wales). 1001. 



4 P i 



