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1.         Abdomen with pleura on first 8 segments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dubiraphia

           Abdomen with pleura on first 5-7 segments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.        Prothorax with a posterior sternum so procoxal cavities are closed behind. . . . . . . . . . . . . . . . 3

           Prothorax without a posterior sternum; procoxal cavities open behind. . . . . . . . . . . . . . . . . . . 5

3.        Posterolatral margins of abdominal segments 1-8 produced into spone-like processes; body            rather robust. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ancyronyx variegata

           Margins of abdominal segments not produced inot spines; bondy elongate. . . . . . . . . . . . . . . 4

4.         Anterior margin of head on each side with a distinct frontal tooth. . . . . . . . . . . . . . Stenelmis

           Anterior margin of head without diatinct frontal tooth. . . . . . . . . . . . Microcylloepus pusillus

5.         Mesopleuron composed of 1 part. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Optioservus

           Mesopleuron composed of 2 parts. . . . . . . . . . . . . . . . . . . . . . . . . Macronychus glabratus

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