1.         Hind coxae globular and about same size as other coxae; posterior margin of prosternal             process almost as wide as head. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

            Hind coxae transverse and larger than other coxae; posterior margin of prosternal process             much narrower than width of head. . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . 3

2.         Black; elytra with sublateral carinae; antennae with 7 segments, enlarged at apex; pronotum             without transverse impressions. . . . . . . . . . . . . . . . . . . . . . . . . . Macronychus glabratus

            Conspiuously colored with black and yellow or orange; elytra and pronotum without                         sublateral carinae; antennae with 11 segments, filiform; pronotum with oblique transverse             impression at apial third; tasal claw with a basal tooth. . . . . . . . . . . Ancyronyx variegata

3.          Anterior tibia with a fringe of tomentum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

            Anterior tibia without a fringe of tomentum. . . . . . . . . . . . . . . . . . . . . . . . . . .Stenelmis

4.         Lateral margin of 4th or 5th abdominal sternites produced as a prominent lobe or tooth,             which is bent upward to clasp the epipleuron; epipleuron windened to receive tooth, then             ususally narrowing abruptly toward apex. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

            Lateral margin of abdominal sternites not produced into a prominent upterned tooth;             epipleuron usually tapering uniformly toward apex. . . . . . . . . . . . . . . . . . . . . .Dubiraphia

5.          Tooth that clasps epipleuron arising from lateral margin of 5th abdominal sternite. . . . . . . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Macrocylloepus pusillus

            Tooth that clasps epipleuron arising from apical (posterior) lateral margin of 4th abdominar             sternite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Optoservus

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