(Page 277) 



grooved at base and of equal length, the fifth longsr than the fourth. 



The legs short; tarsi short and flat, all 4-jointed, the first three joints 



cleft at tip, claw-joint roundly sole-shaped and terminated with a small 



wart ( a rudimentary' fifth joint ?), upon which the claws are attached; 



first joint of hind tarsi as long as the two following together. 



Only 1 species is known of this genus, which is distributed in North 



and Middle Europe, and which lives at lakes, swamps and streams on water 



plants. 



1. H. dimidiata Gravh. 



(Jravh. Micr. 149; Erichs. Kaif. Mk. Br. I, 313; Jen. Spec. Staph. 80; 

 Kraatz Ins. D. II, 341; Thorns. Skand. Col. 11,271; Muls. et Bey Brevip. 

 1873, 94; Janglb. Kaf. M. II, 312). 



In combination with the flat, evenly broad form of the body, and other 

 above denoted chai-acters this species is easily identified by the sharply 

 defined colors of the elytra. 



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Black, dull, very finely and rather densely haired; elytra yellow, but 

 their foremost third part limited black; antennae brownish, their base, 

 mouth-parts and legs red-yellow. 



Sorsally the entire body with particularly dense, on head robust, else- 

 where rather fine punctation; the head large, flat, in the o at middle 

 slightly impressed; second end third joints of the antennae .about, equally 

 loEii, the next-last scarcely transverse; pronotum (see above) flat, at middle 

 more (3*) or less (p ) distinctly grooved, together with elytra and abdomen 

 without erect side-bristles. L. 2.6-3 mm. 



.47&- 



