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7(6).   Third elytral interval wide, 1.7-2.6 times as wide as second 
        (most noticeable around anterior silver spot). Pronotum 
        flatter, with flaring hind angles. (Holarctic.) 
        .....................................B. lapponicum Zetterstedt

        
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7'.     Third elytral interval narrower, 1.4-1.6 times as wide as 
        second. (As you can see from the figures, this difference is 
        not striking in some specimens.) Pronotum more convex, hind 
        angles less prominent. (Palearctic.) 
        .......................................B. velox (Linné)

        
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