Key to the Afrotropical species of Lusius Tosquinet, 1903 (updated from Rousse et al. 2013)

1. Clypeus as wide as high, strongly pointed apico-laterally (A); flagellum entirely testaceous (male unknown) (B)......................................................................... L. flummox Rousse & van Noort, 2013

– Clypeus wider, about one and a half times wider than high, weakly pointed apico-laterally (a); flagellum tri-coloured in both sexes: basally testaceous, medially white and apically black (b)........ .......................................................................................................... L. tenuissimus (Heinrich, 1938)