(Page 19C) 

 tenin^; abdomen glistening; its first four free dorsal joint depressed 

 at base; the first three and base of the fourth robustly and densely 

 punctated, the hindmost half of the fourth and the entire fifth in the o. 

 with fine and simple, in the o^with fine and simple granulate punctation. 

 L. 2-2.5 mm. 



In the o the sixth free dorsal joint of abdomen in the posterior mar- 

 gin with four small, yet distinct teeth, separated by equally large, slight- 

 ly incurved intervals. 



In wet bojs and meadows, at the shores of rivers and lakes, where it 



lives in the leaf sheath of reeds and in the leaf -corners of other water 



plantsi from which it is washed to shore in alluvium, often in company 



with incana. Distributed in Middle and North Europe; rather rare in this 



country. 



31. Subgenus Dadobia Thoms. 



94. H. immersa £r. 



(Srichs. Kaf. Mk. Er. I, 324; ien. Spec. Staph. 96; Kraatz Ins. D. II, 

 252; Sharp Rev. Brit. Horn. 165; Muls. et Fey Brevip. 1875, 322; ^anglb. 

 Kaf W. II, 133. - planicollis Thoms. Skand. Col. II, 287). 



A small, very characteristic species, narrow, flat and of even breadth, 

 and with four transversally grooved abdominal joints, but especially re- 

 markable by a peculiarly, square head, which makes it easy to recognize 

 in the entire genus. 



Deeply black, glistening, very finely and sparsely haired; the anten- 

 nae pitch-black or pitch-brown with brownish-yellow base; legs brov/nish 

 yellow with blackish-brown femora. 



».322» 



