Previous Step (6b)
32a Pronotum with exceedingly high median carina, semi-circular in outline, highest portion about as deep as lateral lobes. Rare in Wyoming.
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Tropidolophus formosus (Say)
32b Pronotum with median carina never as high, less than one-third the depth of lateral lobes. Median carina never semi-circular in outline. go to 33
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