(Page 573) 

 punctation and dull, slightly convex, posteriorly at middle with two 

 rather deep, anteriorly slightly divergent, longitudinal grooves, often 

 transversally divided, separated by a middle carina, in middle-line be- 

 fore this often with a feeble fovea; elytra about lg times as lon^ as 

 pronoturr., densely and rather robustly punctated, along the suture slight- 

 ly groove-like impressed; abdomen very finely and especially densely 

 punctated. L. 3-3.5 mm. 



Distributed in Europe, North Asia, North America and Australia; In 

 this country common on damp ground, in alluvium and at rotting plants, 

 also at manure. 



3. I. rivularis Motsch. 



(Motsch. Bull. Mosc. 1860, 558; ianglb. Kaf. U. II, 651. - bilineatus 

 Srichs. Kaf. Mk. Br. I, 600; Sen. Spec. Staph. 806; Kraatz Ins. E. II, 

 87?.; Thorns. Skand. Col. Ill, 135; Kuls. et Rey Bre'vip. 1879, 271). 



Very closely allied to preceding species, from which it is separates 

 by the following details, which however are not always equally distinct- 

 ively developed: (Page 57<±) 



It is ordinarily somewhat smaller and narrower; the body more deep- 

 ly black, elytra very rarely brownish, legs often dark; pronotum at sides 

 scarcely scabrose-punctated, and not dull, its sides before middle less 

 stror.jly and more gradually rounded, fore-corners not acutely prominent, 

 but are rounded off; elytra with distinctly finer and denser punctation. 

 L. 2.7-3 mm. 



Under similar conditions as bilineatus , but apparently less widely 

 distributed and more local; it is here found in Sjaelland, rarer in the 

 other parts of %he country (landers, Aalborg and other places). 



-80- 



