156a (155a). Metasternum with a distinct transverse suture demarking a
triangular antecoxal
suture..........................................................................................………...........................................
157
156b. Metasternum without a transverse suture or antecoxal sclerite;
body smooth and hard;
hind legs
flattened and fringed with long hairs (Figs.A-C) (predators of
aquatic
arthropods).....................................................................…..................…..........( Coleoptera) Dytiscidae
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A B C