Key to Chinese species of Scoparia based on known female genitalia

1. Corpus bursae with two signa ............................................................................................ Scoparia brunnea (Leraut)

- Corpus bursae with one signum or without signum ................................................................................................... 2

2. Corpus bursae without signum ................................................................................................................................... 3

- Corpus bursae with one signum .................................................................................................................................. 4

3. Ductus bursae about two and half times as long as corpus bursae .............................................. S. jiuzhaiensis sp. n.

- Ductus bursae a bit longer than corpus bursae ................................................................................ S. brevituba sp. n.

4. Colliculum with sclerotized protuberance .................................................................................................................. 5

- Colliculum without sclerotized protuberance ............................................................................................................. 8

5. Sclerotized protuberance of colliculum semicircular ................................................................................................. 6

- Sclerotized protuberance of colliculum thumb-shaped or annular ............................................................................. 7

6. Sclerotized protuberance at lateromedian margin of colliculum ........................................................ S. spinata Inoue

- Sclerotized protuberance at anterior margin of colliculum ................................................. S. metaleucalis Hampson

7. Sclerotized protuberance of colliculum thumb-shaped; anterior half of ductus bursae curved ........ S. sinensis Leraut

- Sclerotized protuberance of colliculum annular; anterior half of ductus bursae straight ................. S. uncinata sp. n.

8. Colliculum about half length of ductus bursae ........................................................................................................... 9

- Colliculum a lot shorter than half length of ductus bursae ....................................................................................... 10

9. Ductus bursae with three folds ............................................................................................................ S. spinosa sp. n.

- Ductus bursae with one fold ........................................................................................................ S. subgracilis Sasaki

10. Ductus bursae membranous before colliculum .................................................................................... S. utsugii Inoue

- Ductus bursae with swollen and sclerotized part before colliculum ........................................................................ 11

11. Swollen and sclerotized part of ductus bursae slightly thicker than its median part ................................................ 12

- Swollen and sclerotized part of ductus bursae about twice or more than twice as thick as its median part ............. 14

12. Antrum curved at anterior third, posterior two thirds twice as thick as anterior third .................. S. largispinea sp. n.

- Antrum nearly straight, same thickness throughout ................................................................................................. 13

13. Ductus bursae sclerotized and armed with longitudinal pleats in about median third ................ S. tohokuensis Inoue

- Ductus bursae membranous anterior to colliculum .................................................................... S. taiwanensis Sasaki

14. Colliculum about one third length of ductus bursae ................................................................................................. 15

- Colliculum much shorter than one third length of ductus bursae ............................................................................. 16

15. Ductus bursae looped before colliculum, not swollen ................................................................ S. congestalis Walker

- Ductus bursae not looped, swollen in oval before colliculum, nearly as large as corpus bursae .. S. yamanakai Inoue

16. Ductus bursae protuberant and spinulose lateromedially ..................................................... S. ancipitella (La Harpe)

- Ductus bursae even, not spinulose ....................................................................................................... S. bifaria sp. n.