1	Head with interocular punctures present on frons (Brunke et al. 2019: fig. 1); eyes small, less than half the length of temples; pronotum with four punctures in dorsal row; empodial setae absent; Nepal, Pakistan and China	Strouhalium Scheerpeltz (S.gracilicorne Scheerpeltz)
–	Head without interocular punctures on frons; eyes large, clearly longer than temples; pronotum with two punctures in dorsal row; empodial setae present; western Nearctic, East Palaearctic and Oriental Regions	2
2	Head and pronotum without microsculpture, highly glossy; head with bulging eyes occupying nearly all of lateral head; East Palaearctic and Oriental Regions; 39 spp., listed by Brunke et al. (2016)	Indoquedius Blackwelder
–	Head and pronotum with meshed microsculpture creating dull (especially head) appearance; head with eyes smaller and less convex, occupying ~ 2/3 of lateral head (Fig. 3A); western Nearctic	Fluviphirus Brunke, gen. nov. (F.elevatus (Hatch))