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 MotschulskyClick on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window2'. 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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