161a (160a). Abdominal sternites freely movable (%% only; also refer to couplet 182); abdomen

tip exposed beyond elytra; last tarsal segment elongated, others are short (Figs.A-D) (predators)

…………………………………………………………...............…………(Coleoptera) Rhizophagidae

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A B C D

161b. First 2-4 abdominal sternites somewhat fused or immovable; eyes usually notched; most

are black or brownish (Figs.A-H) (predators)...................………....(Coleoptera) Tenebrionidae

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A B C D E

F G H