Ypsolopha vittella

Key to species of Ypsolopha vittella -group based on male genitalia

(exclusive of Y. hebeiensis)

1. Cornuti as two large spines............................................................................ 2

- Cornuti as two clusters of microspines or other types ....................................................... 10

2. Phallus nearly as long as valva (Fig. 113)...................................................... Y. sarmaticella

- Phallus conspicuously longer than valva.................................................................. 3

3. Saccus longer than socius.............................................................................. 4

- Saccus as long as or shorter than socius................................................................... 5

4. Coecum broader than and 1/6 length of phallus (Fig. 116)................................... Y. longisaccata sp. nov.

- Coecum narrower than and 1/3 length of phallus (Fig. 125).................................... Y. purpurata sp. nov.

5. Uncus subulate...................................................................................... 6

- Uncus not subulate................................................................................... 7

6. Phallus curved at middle, coecum 1/5 length of phallus (Fig. 109)........................... Y. flaviterminata sp. nov.

- Phallus straight, coecum 1/7 length of phallus (Fig. 110)........................................ Y. flavida sp. nov.

7. Valva broadest at apex (Fig. 105).................................................................. Y. vittella

- Valva broadest before apex............................................................................ 8

8. Cornuti stout, 4/5 length of phallus (Fig. 107)..................................................... Y. amoenella

- Cornuti slender, not longer than half length of phallus....................................................... 9

9. Coecum about 1/6 length of phallus, cornuti 1/3 length of phallus (Fig. 112).............................. Y. parallela

- Coecum about 1/3 length of phallus, cornuti 1/2 length of phallus (Fig. 119)............................... Y. acerella

10. Vinculum angularly protruded anteriorly on both sides...................................................... 11

- Vinculum rounded anteriorly.......................................................................... 13

11. Saccus 2/3 length of socius (Fig. 114)......................................................... Y. parenthesella

- Saccus 1/3 length of socius........................................................................... 12

12. Phallus sharp at apex, coecum 1/10 length of phallus (Fig. 115).................................... Y. albula sp. nov.

- Phallus not sharp at apex, coecum 1/5 length of phallus (Fig. 117)............................ Y. fascimaculata sp. nov.

13. Cornuti with several larger spines at end of each row of microspines........................................... 14

- Cornuti without larger spine at end of each row of microspines............................................... 17

14. Valva semicircular, phallus strongly curved at middle....................................................... 15

- Valva not semicircular, phallus straight.................................................................. 16

15. Socius sharply narrowed to a thorn on apical 1/6, saccus slightly shorter than socius (Fig. 122)...... Y. mucronulata sp. nov.

- Socius gradually narrowed to a point distally, saccus 2/3 length of socius (Fig. 123)................. Y. bicostata sp. nov.

16. Saccus longer than socius (Fig. 111)............................................................. Y. asperella

- Saccus shorter than socius (Fig. 106)............................................................. Y. japonica

17. Socius dilated at middle (Fig. 108)............................................................ Y. leuconotella

- Socius not dilated at middle........................................................................... 18

18. Coecum 1/3 length of phallus.......................................................................... 19

- Coecum 1/5 length of phallus.......................................................................... 20

19. Saccus as long as socius, sharp at apex (Fig. 118)................................................... Y. scabrella

- Saccus 3/4 length of socius, truncate at apex (Fig. 121)............................................. Y. horridella

20. Anellus densely hairy on distal half (Fig. 120)........................................................ Y. yangi

- Anellus sparsely denticular (Fig. 124)..................................................... Y. latiuscula sp. nov.