1	Anterior margin of eye emarginate in lateral view, oblique and posteriorly directed in dorsal view (Fig. 2A–C); glabrous patch on metaventrite broad, ovoid to diamond-shaped (Kohlenberg and Short 2017: fig. 10)	2
–	Anterior margin of eye straight, at most only slightly emarginate in lateral view, oblique and anteriorly directed in dorsal view (Fig. 2D–I); glabrous patch on metaventrite shaped as a narrow longitudinal bar (Fig. 3D, E)	3
2	In lateral view, eye narrowing to about a quarter of its dorsal width	emarginatus species group
–	In lateral view, eye narrowing to about half or slightly less of its dorsal width	sulcatus species group
3	Hydrofuge pubescence on abdominal ventrites scanty; few metatibial spines, reduced in size; metatarsomere 2 much shorter than metatarsomere 5	luteomargo species group
–	Hydrofuge pubescence on abdominal ventrites very densely distributed; metatibial spines large and rather dense; metatarsomere 2 nearly as long as metatarsomere 5	communis species group