660 On Aquatic Carnivorous Coleoptera or Dytiscide. 
some very short impressions on the lateral 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 emargination. 
‘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. Aubé 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 Dejean’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. 62 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. 
his 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 seen, tewards 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; (Alsatia ; Sardinia; Italy; Caucasus, sec. Cat. Munich). 1017. 
1029. Hydaticus dorsiger, Aubé, M.C.—Robustus, ovalis, sat convexus, subtus 
ferrugineus, supra testaceus, vertice prothoraceque basi in medio nigris, elytris sat 
crebre nigro-irroratis, plaga communi suturalt, elongata, nigra, antennis pedibusque 
anterioribus rufis. Long. 132, 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. 
