Key to Chinese species of the genus Atkinsonia based on male and female genitalia

1 Male.............................................................................................. 2

- Female............................................................................................ 7

2 Sacculus about same length as valva..................................................................... 3

- Sacculus shorter than valva............................................................................ 5

3 Uncus deeply bifurcate distally, forming two large triangular processes (Fig. 17)........................... A. furcata

- Uncus shallowly notched apically, forming two tooth-like processes............................................ 4

4 Uncus gradually narrowed from base toward apex (Fig. 15).......................................... A. beijingana

- Uncus gradually narrowed from base to 3/5, then slightly broadened toward apex (Fig. 19)................. A. swetlanae

5 Aedeagus bilobed apically, sacculus about 1/3 length of valva (Fig. 16)....................... A. brevisaccula sp. nov.

- Aedeagus not bilobed apically, sacculus longer than 1/3 length of valva......................................... 6

6 Valva without group of dense long hairs at middle (Fig. 18)........................................... A. ignipicta

- Valva with group of dense long hairs at middle (Fig. 20).................................... A. parignipicta sp. nov.

7 Ductus seminalis without dilation (Fig. 24)....................................................... A. swetlanae

- Ductus seminalis with dilation.......................................................................... 8

8 Ductus seminalis about four times length of corpus bursae (Fig. 21)................................... A. beijingana

- Ductus seminalis less than four times length of corpus bursae................................................. 9

9 Ductus seminalis with dilation at middle (Fig. 22).................................................. A. butalistis

- Ductus seminalis with dilation between 1/2 and 3/4 (Fig. 23)................................... A. clerodendronella