Pterostoma

Dolinskaya, Irina V., 2019, The use of egg characters for the classification of Notodontidae (Lepidoptera), with keys to the common Palaearctic genera and species, Zootaxa 4604 (2), pp. 201-241 : 229

Pterostoma

1 Transition region represented by 5–7 bands of cells with flat cell floors (Fig. 89)............................. P. sinica

- Transition region represented by 7–9 bands of cells, where first 3–4 bands are prominent and with deeply concave, folded cell floors, following 4–5 bands with flat cell floors ( Figs. 33 , 90)...................................................2

2 Russia (Transbaical, Amur, Primorye), Korea, Japan, China............................................. P. griseum

- From Europe to Chita Region ( Russia), Turkey, Transcaucasus, Azerbaidshan, Iraq, Iran...................... P. palpina

Figures

FIGURES 31–34. Eggs of Notodontidae. 31. Fentonia ocypete, transition region. 32. Fentonia ocypete, part of lateral area. 33. Pterostoma palpina, transition region. 34. Pterostoma palpina, part of lateral area. Scale bars 31–34 (10 µ).