Peridea

1 Sculpture poorly discernible, cell walls weakly expressed or absent (Fig. 115). Distributed around Caspian Sea in Azerbaijan and N. Iran ................................................................................... P. murina

- Sculpture and cell walls clearly expressed. Distribution —— Western or eastern part of Palaearctic region...............2

2 Chorion solid, opaque.................................................................................. 3

- Chorion translucent................................................................................... 5

3 Cells with broad walls and clearly expressed aeropyles. Far East Russia Korea, Japan, China ..........................4

- Cells with moderately broad walls and weakly expressed aeropyles (Fig. 116). From Europe to South Ural region (Russia)................................................................................................ P. anceps

4 Cell walls with medial grooves (Fig. 117). Quercus (Fagaceae) .......................................... P. lativitta

- Cell walls without grooves (Fig. 118). Ulmus (Ulmaceae) ............................................. P. graeseri

5 Cell floor sculpture clearly expressed and with densely interwoven fibers (Figs. 119,120, 121).................................................................................................... P. elzet, P.aliena, P. jankowskii

- Cell floor sculpture weakly expressed (Figs. 122–124)........................................................ 6

6 Cell walls with medial grooves (Fig.124)......................................................... P. moltrechti

- Cell walls without grooves.............................................................................. 7

7 Oviposition on Quercus (Fagaceae) ................................................................ P.gigantea

- Oviposition on Alnus (Betulaceae) ............................................................... P. oberthueri