Key to the Chinese species of the genus Willowsia

1. Abd. II with 2 mac..................................................................................... 2

-. Abd. II with more than 2 dorso-central mac................................................................. 3

2. Abd. III with 1 dorso-central mac..................................................... W. formosana Denis 1929

-. Abd. III with 2 dorso-central mac................................................... W. jacobsoni (Börner, 1913)

3. Abd. II with 3 dorso-central mac......................................................................... 4

-. Abd. II with more than 3 dorso-central mac................................................................. 6

4. Abd. III with 2 dorso-central mac...................................... W. guangdongensis Zhang, Xu & Chen, 2007

-. Abd. III with 3 dorso-central mac......................................................................... 5

5. Abd. I with 2−3 mac........................................................ W. nigromaculata (Lubbock, 1873)

-. Abd. I with 4 mac...................................................... W. qui Zhang, Chen & Deharveng, 2011

6. Abd. II with 4 dorso-central mac........................................................ W. pseudoshi sp. nov.

-. Abd. II with 5 dorso-central mac......................................................................... 7

7. Abd. III with 2 dorso-central mac......................................................................... 8

-. Abd. III with 3 dorso-central mac......................................................................... 9

8. Abd. I with 4 mac.......................................................... W. guangxiensis Shi & Chen, 2004

-. Abd. I with 7−8 mac................................................................... W. variabilis sp. nov.

9. Scales absent on antennae......................................... W. yiningensis Zhang, Chen & Deharveng, 2011

-. Scales present on antennae................................................... W. shiae Pan, Zhang & Chen, 2006