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5(4).   Large (standardized body length generally more than 6.2 mm) 
        and shiny, with wide body. Prothorax wide at base, with 
        sides little sinuate. Mentum tooth large, bulbous, 
        rectangular, without distinct epilobes 
        .......................................B. punctatostriatum Say

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 5'. Smaller (standardized body length generally less than 6.2 mm) and in most specimens duller. Body proportions more normal, not atypically wide. Prothorax more constricted near base. Mentum tooth smaller, flatter, triangular or trapezoidal, epilobes distinct ..............................6
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