Tridrepana species

Song, Wenhui, Xue, Dayong & Han, Hongxiang, 2011, A taxonomic revision of Tridrepana Swinhoe, 1895 in China, with descriptions of three new species (Lepidoptera, Drepanidae), Zootaxa 3021, pp. 39-62 : 41-42

Key to Chinese Tridrepana species , based on external and male genitalic features

(Partly following Watson, 1957)

1. Ventral side of forewing with an oblique brownish black band from apex to inner margin; hind tibia with two pairs of spurs............................................................................................ T. flava flava

- Ventral side of forewing without the band as above; hind tibia with one pair of spurs................................ 2

2. Upperside of forewing without mid-cell spot.................................................... T. argentistriga

- Upperside of forewing with mid-cell spot................................................................... 3

3. One dark oval patch near the lower angle of cell on upperside of forewing, or patch absent; uncus deeply bifurcate, with branches long, fork like; valva long, bending upwards......................................................... 4

- Two big patches near the lower angle of cell on upperside of forewing; uncus divided into two stout lobes, concave at middle; valva degenerate, short................................................................................ 13

4. One dark oval patch near the lower angle of cell on upperside of forewing......................................... 5

- No patch near the lower angle of cell on upperside of forewing................................................. 8

5. Uncus bifurcate to the base, branches slender; valva slender, acute apically; anellus big, as long and broad as valva................................................................................................. T. fulvata brevis

- Uncus bifurcate less than one third length of uncus, branches broad; valva broad, truncate apically; anellus a small stick, much shorter and slenderer than valva.......................................................................... 6

6. Saccus of male genitalia slender; socii twice as long as its base width............................... T. arikana emina

- Saccus of male genitalia stout; socii as long as its base width................................................... 7

7. Outer lateral surface of each process of uncus with strongly toothed carina....................... T. arikana falcipennis

- Uncus only weakly carinate laterally, with a single small tooth.................................... T. arikana arikana

8. Branches of uncus bifurcate............................................................................. 9

- Branches of uncus not bifurcate......................................................................... 10

9. Inner forks of uncus branches bending outwards, about one half length of outer forks, apex round............. T. bifurcata

- Inner forks of uncus branches straight, about one third length of outer forks, apex pointed........... T. bicuspidata sp. nov.

10. Valva gradually broadened from base to terminal one third, then suddenly narrowing and digitiform terminally.............................................................................................. T. subunispina sp. nov.

- Valva gradually narrowing to apex....................................................................... 11

11. Anellus and ventral plate of the gnathos narrow...................................................... T. unispina

- Anellus and ventral plate of the gnathos broad.............................................................. 12

12. Socii short; dorsal median process of gnathos semicircular; ventral plate of the gnathos nearly papilionaceous, with apex round; basal part of anellus convex with two acute forks................................................. T. crocea

- Socii long; dorsal median process of gnathos elliptic, concave medially; ventral plate of the gnathos nearly U-shaped, with apex pointed; basal part of anellus not convex....................................................... T. hainana

13. Upperside of forewing and posterior half of hind wing irrorated with dark brown scales................... T. thermopasta

- Upperside of wings not as above......................................................................... 14

14. Forewing with two white patches ringed by brown lines on the base of M 3 and CuA 1 ....................... T. marginata

- Forewing with two big round brown patches below the base of M 3 and CuA 1 ...................................... 15

15. Ground colour on upperside of both wings brownish orange, not bright yellow; spots on the upperside of both wings small and indistinct....................................................................................... T. fulva

- Ground colour on upperside of both wings pale yellow to bright yellow; spots on the upperside of both wings thick and distinct ................................................................................................... 16

16. The antemedial and postmedial lines of both wings composed of biggish dark spots; the patches near the lower angle of cell on upperside of forewing without dark spots inside.................................................... T. maculosa

- The antemedial and postmedial lines of both wings composed of small clear spots; the patches near the lower angle of cell on upperside of forewing with dark spots inside or just left of the dark spots themselves............................... 17

17. A brown shadow from apex extending to the middle of the inner margin on upperside of the forewing................. 18

- No shadow on the distal part on upperside of the forewing.................................................... 19

18. Ground colour of wings and the shadow on the forewing from apex to the middle of the inner margin pale; mid-cell and discal spots big, pale; the posterior margin of the uncus lobes a little round, with apical angles distinctly extended........................................................................................ T. rubromarginata rubromarginata

- Ground colour of wings and the shadow on the forewing from apex to the middle of the inner margin dark; mid-cell and discal spots small, dark; the posterior margin of the uncus lobes truncate, with apical angles a little extended.................................................................................................... T. rubromarginata indica

19. Two small brownish black spots under M 3 and CuA 1 near the lower angle of cell on upperside of forewing......... T. hypha

- Two big grayish brown patches centered by the dark spots near the lower angle of cell on upperside of forewing......... 20

20. Forewing apex more falcate; a grayish brown line outside the postmedial line on upperside of forewing.......... T. sadana

- Forewing apex less falcate; no line outside the postmedial line on upperside of forewing............................ 21

21. Ground colour bright yellow; the lobes of uncus not divided into two parts................................... T. finita

- Ground colour pale yellow; each lobe of uncus divided into two parts, an inner semicircular half and an outer elongate branch................................................................................... T. subadelpha sp. nov.