1 Wings and elytra developed, body wedge-shaped, eyes holoptical, antennae partially flabellate (males)................................................................................................................. 2

– Wings and elytra absent, body larviform, eyes small, placed antero-laterally on the head, antennae simple (females)............................................................................................... 3

2 Antennae 11-segmented with eight distal antennomeres uniflabellate, postocular ommatidia present, pronotum trapezoid, flat, maxillary palpi reduced to bifurcate stylus..................................................................................................................... Ripidius Thunberg, 1806

– Antennae 10-segmented with seven distal antennomeres uniflabellate, postocular ommatidia absent, pronotum anteriorly above the neck narrower and elevated, maxillary palpi reduced to knob-like tubercle................................................. Blattivorus Chobaut, 1891

3 Antennae 11-segmented, tarsomeres with full heteromerous pattern (tarsal formula 5-5- 4)................................................................................................ Ripidius Thunberg, 1806

– Antennae 3-segmented, number of tarsomeres reduced in all legs (tarsal formula 1-1-1)................................................................................................... Blattivorus Chobaut, 1891