1	Abdomen with white guanine spots, epigyne with one atrium, copulatory openings widely spaced	2
–	Abdomen without white guanine spots, epigyne without atrium, but with two separate openings	3
2	Atrium with a septum (Fig. 41), insemination ducts short, not encircling receptacle	Lathys humilis
–	Atrium without septum (Figs 37–38), insemination ducts long, encircling receptacles (Fig. 18, 24, 39)	Lathys ankaraensis sp. n.
3	Copulatory openings small, spaced by approx. 1/2 diameters	Lathys lehtineni
–	Copulatory openings large, separated by thin septum (Fig. 20)	Lathys stigmatisata