66U On Aquatic Carnivorous Coleoptera or DytiscidcB. 



some very short impressions on the hxteral parts of the thorax. The apex of" the 

 last ventral segment is emarginate in the male, while in the female there is a small 

 channel along the middle of the apical portion, terminating in an excessively 

 minute emargmation. 



The species is remarkable by its highly polished surface, destitute of punctuation 

 except tor the serial punctures of the wing-cases; the yellow marks of the wing- 

 cases are much broken up, and very irregular and variable, and when they attain 

 their greatest extent are, especially at the sides and apex, spotted with black. 



I have seen very few specimens. Aube was wrong in stating the front margin of the 

 thorax to be black ; and also in describing the thorax of the female to be without 

 impressions. His type from Dej can's collection is before me, and is in fact the only 

 individual of that sex I have seen. 



Cape of Good Hope. 1019. 



1028. Dytiscus grammicus, Germ., Hydaticus grammicus, M.C. — Ovalis, parum 

 elongatus, sat latus et convexus, supra conspicue punctulatus, rufo-testaceus, vertice 

 nigro, elytris nigro-irroratis, irrorationibus versus suturam in lineas longitudinales 

 nigras a lineis flavis separatis condensatis. Long. 11, lat. 6h m.m. 



In the male the fringing hairs of the front tarsi are highly developed, and the 

 palettes are rather large, the basal ones being a good deal larger than the rest. 

 The female has the sides of the thorax roughened by short impressions. 



This is a species of rather short, broad and rounded form ; near the sides of the 

 wing-cases the black colour is formed by nearly isolated dots, having however a 

 more or less distinct linear arrangement, also at the base and apex of the elytra 

 these black dots can be scan, towards the suture however the dots are condensed 

 into dense black lines, separated by more or less distinct yellow lines of variable 

 width. The species is also remarkable by its more than usually distinct 

 punctuation. 



Europe and Japan; (AJsatia; Sardinia; Italy; Caucasus, sec. Cat. Munich). 1017. 



1029. Hydaticus dorsiger, Aube, M.C. — Robustus, ovalis, sat convexus, subtus 

 ferrucrineus, supra testaceus, vertice prothoraceque basi in medio nigris, elytris sat 

 crebre ni»ro-irroratis, plaga communi suturali, elongata, nigra, antennis pedibusque 

 anterioribus rufis. Long. I3i, lat. 8 m.m. 



The front tarsi of the male are large and highly developed, the fringing hairs 

 being elongate, and the palettes large, those at the base indeed are very large ; 

 the female has the lateral portion of the thorax covered with deep coarse connected 

 impressions. 



