Subfamily STERRHINAE

Key to the genera

1. Eyes small, diameter of eye less than width of frons (Figs. 3C, 3F).............................................. 2

- Eyes developed normally, diameter of eye not less than width of frons (Fig. 3G)................................... 4

2. Forewing no longer than 6 mm, with no areoles; male antenna bipectinate (Fig. 3E).............................................................................................. Cleta Duponchel, 1845 ( jacutica Viidalepp, 1976)

- Forewing longer than 8 mm, with areole (Fig. 4E)........................................................... 3

3. Wings with inconspicuous veins, hindwing with no dark transverse lines (Fig. 31A); male antenna bipectinate........................................................................ Lythria Hübner, 1823 ( purpuraria Linnaeus, 1758)

- Both wings commonly with distinct dark transverse lines and veins (Figs. 22D, 23A); male antenna ciliate-fasciculate (Fig. 3D).............................................................................. Holarctias Prout, 1913

4. Forewing with double areole (Fig. 4F).............................................. Rhodostrophia Hübner, 1823

- Forewing without areole or with single areole............................................................... 5

5. Hindwing venation: RS and М1 stalked (Figs. 4H, 4I)......................................................... 6

- Hindwing venation: RS and М1 arise from discal cell separately (Fig. 4G)...................... Scopula Schrank, 1802

6. Male antenna bipectinate; hindtibia of female with 2 pairs of spurs.............................................. 7

- Male antenna filiform; hindtibia of female with one pair of spurs.............................. Idaea Treitschke, 1825

7. Forewing venation: R1 arises from areole before branching of vein R5 (Fig. 4H). Hindwing termen usually with angle or projection or short tail on vein М3. Upper-side of wings pale greyish-yellow, with oblique dark line running from forewing apex to inner margin of hindwing; discal spots not ringed, or absent............................ Timandra Duponchel, 1829

- Forewing venation: R1 arises from common stalk of R2–R4, after branching of vein R5 (Fig. 4I). Hindwing termen rounded, with no conspicuous projection; wings with no oblique line; discal spot of both wings ringed, with white center (Fig. 29D)........................................................ Cyclophora Hübner, 1822 ( albipunctata Hufnagel, 1767)