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2. Haliplus Heydeni Wehncke. 



Breviter subovatus, ferrugineus, nitidus, capite in vertice, 

 thorace antice infuscatis; prosterno canaliculato ; thorace vage 

 punctato, ad basin utrinque dilucide impresso ; elytris valde striato- 

 punctatis, fusco-lineatis maculatisque ; elytris posticis attenuatis, 

 interstitiis sparsim punctulatis (secundo, quarto, sexto 3 — 5 punctis). 



Long. 2V4— 2V4 mm. Lat. l'/*— l'A mm. 



(f et Q. elytris glabris. 



In aquis stagnantibus, praecipue lutosis. 



3. Haliplus fluviatilis Ksw. (ex parte). 



Subovatus, pallide testaceus, capite in vertice, thorace antice 

 et in apicem satis crebre punctulatis; prosterno piano; elytris 

 striato-punctatis, interrupte fusco-lineatis, interstitiis raro punc- 

 tatis (secundo, quarto, sexto 7 — 9 punctis). 



Long. S'/g mm. Lat. ly^ mm. 



(f. Elytris glabris. 



Q. . Elytris in postica dimidia parte subtilissime punctulatis. 



In aquis fluentibus et stagnantibus. 



4. Haliplus fulvicollis Er. 



Ovatus, rufo-ferrugineus, capite in vertice, thorace antice in- 

 fuscatis; prosterno piano; capite crebre thoraceque vage punctu- 

 latis, ad basin utrinque lineola impressa, elytris striato-punctatis, 

 maculatis, maculis cum sutura connexis. 



Long. 2V2 — 2% mm. Lat. l'A — iVj mm. 



In aquis stagnantibus uliginosis. 



