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2(1).   Pronotum small in comparison to the long elytra (ratio of 
        elytral length to pronotal width 2.44-2.60). Male 
        protarsomere 1 relatively large (the tarsus shown below is 
        at the same scale as that shown in the other half of this 
        couplet for B. balli; note the relative sizes of the the 
        first and third protarsomere). ..........B. foveum Motschulsky

        
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 2'. Pronotum and elytra of typical proportions (ratio of elytral length to pronotal width 2.25-2.35). Male protarsomere 1 of normal size .................................B. balli Lindroth
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Bembidion (Bracteon)

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