Key to Archiearis species of the Baikal region

1. Male antenna bipectinate (Fig. 3A); fringe of both wings unchequered; forewing with weak light costal spots or without them, hindwing with small discal spot. In male genitalia (Figs. 32C, 32D) valva comparatively broad and short, narrowing medially; uncus strongly broadened medially; aedeagus with narrowed coecum. In female genitalia (Fig. 32I) signum comparatively short, lanceolate; ovipositor long, apophyses posteriores almost twice as long as apophyses anteriores................................................................................................... A. notha (Hübner, 1803)

- Male antenna filiform (Fig. 3B); fringe of both wings chequered (at least partially); forewing usually with whitish costal spots, hindwing with large discal spot. In male genitalia (Figs. 32A, 32B) valva very long and slender, gradually narrowing distally; uncus not broadened medially, with almost parallel lateral margins; aedeagus with wide rounded coecum. In female genitalia (Fig. 32H) signum elongated, tongue-shaped; ovipositor very short, apophyses anteriores and apophyses posteriores rather short and stout............................................................... A. parthenias (Linnaeus, 1761)