11(10). Duller, elytra in most specimens distinctly duller than pronotum. ed3 and ed5 near center of silver spots. Extra setae between eo4 and eo5 generally absent. Protarsomere 4 ventroapical setae widely separated .....B. alaskense LindrothClick on an image to view larger version & data in a new window11'. Dorsal surface, including elytra, shinier. ed3 and ed5 at or near anterior edge of silver spots. Extra setae between eo4 and eo5 generally present. Protarsomere 4 ventroapical setae narrowly separated ......................B. argenteolum Ahrens
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