Jankowskia bituminaria bituminaria (Lederer, 1853)

Diagnosis. This subspecies is similar to J. improjecta in: the forewing outer margin is protruded, the yellowish brown patch outside the postmedial line is faint; the hindwing medial line is equal to the postmedial line in width. But it can be distinguished by the following differences: wing colour is paler; the transverse lines are more distinct. In the male genitalia, the tegumen posterior processes are absent; the terminal half of valva is narrower than in J. improjecta; the left sclerotized process of juxta is stick-like, but lacking in J. improjecta .

Distribution. Russia (South Siberia).