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 with not margined anterior rim, antennae almost filiform and rather long, 

 longer and finer than in Acldota . last Joint of maxillary palpi very lit- 

 tle longer than the next-last. 



Pronotum as broad as or a little broader than long, as broad as or 

 narrower than elytra, and with a foveate impression at middle of side- 

 margins, which posteriorly are sometimes flatly impressed-set-of f ; el- 

 ytra broadened posteriorly, sometimes considerably longer than, and again 

 only as long as pronotum, their outer hind corners rounded off; abdomen 

 more or less broad, sometimes elongate, its sides narrower or broader 

 upturned set off j the middle- and hind-tibiae sometimes finely spinifer- 

 ous, first two joints of hind tarsi somewhat elongate and the first no- 

 ticeably longer than the second, the claw-joint shorter than the four 

 first joints together. In the Q the fore-tibiae are on inner side a lit- 

 tle below the middle dilated in form of a small, obtuse tooth. 



The species live in alluvium, under stones and moss at edges of water; 

 of 4 European species 2 are distributed in North and Middle Europe, and 

 also found in Denmark. 



Key to Species. 

 1. Thorax naked. Abdomen indistinctly punctated, almost smooth. L. 4.5 

 -5.5 mm 1. A. quadrum 5ravh. 



Thorax and abdomen finely haired; the latter rather finely and dens- 

 ely punctated. L. 3.5-4.5 mm 2. A. brachypterum Jravh. 



1. A. quadrum Jravh. 

 (Jravh. Mon. 213; Erichs. Keif. Mk. Br. I, 858; ien. Spec. Staph. 858; 



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