Key to Chinese species of Parastenolechia based on male genitalia

1. Glandiductor asymmetrical............................................................................. 2

- Glandiductor symmetrical.............................................................................. 4

2. Left glandiductor longer than right one (dorsal view) (Fig. 23).................................. P trapezia sp. nov.

- Left glandiductor shorter than right one (dorsal view)....................................................... 3

3. Juxta not dilated basally; valva with inner lobe less than 1/3 length of outer lobe (Fig. 19)............ P. arciformis sp. nov.

- Juxta triangularly dilated basally; valva with inner lobe slightly shorter than outer lobe (Fig. 3)....... P. medispina sp. nov.

4. Outer lobe of valva exceeding end of juxta................................................................ 5

- Outer lobe of valva not exceeding end of juxta............................................................. 6

5. Tegumen with a large membranous process ventrally (Fig. 18)......................................... P. collucata

- Tegumen without process ventrally (Fig. 25)................................................ P. longifolia sp. nov.

6. Juxta merged in basal half, distal 1/6 of lateral margin convex outward semielliptically to before apex (Fig. 24)............................................................................................. P. semielliptica sp. nov.

- Juxta separated in basal half, lateral margin not distinctly convex outward distally.................................. 7

7. Outer lobe of valva longer than juxta (Fig. 16).................................................... P albicapitella

- Outer lobe of valva obviously shorter than juxta............................................................ 8

8. Juxta distinctly widened outward from middle to before apex (Fig. 17)................................ P. argobathra

- Juxta not widened outward from middle to before apex....................................................... 9

9. Valva with outer lobe clubbed (Fig. 22)......................................................... P. claustrifera

- Valva with outer lobe papillary (Fig. 20) or short digitiform (Fig. 21)............................ P. papillaris sp. nov.