Key to species of genus Antonina based on the morphology of second-instar female nymphs (modified from Yang & Kosztarab, 1967)

1 Posterior ostioles present................................................................................ 2

- Posterior ostioles absent................................................................................ 3

2 Leg remnants present as sclerotized pits or dermal invaginations; antennae 2-segmented; multilocular pores absent from dor- sum............................................................................... A. graminis (Maskell)

- Leg remnants absent; antennae 3-segmented; multilocular pores numerous on dorsum................. A. crawi Cockerel

3 Band of multilocular pores present along margin of dorsum.................................................... 4

- Band of multilocular pores absent from along margin of dorsum................................................ 5

4 Dorsal trilocular pores of one size; leg remnants present....................................... A. nanlingensis sp. n.

- Dorsal trilocular pores of 2 sizes; leg remnants absent............................................ A. pretiosa Ferris

5 Disc-like pores present on venter just posterior to posterior spiracles; margin of last 3 abdominal segments lobed................................................................................................... A. zonata Green

- Disc-like pores absent; margin of last 3 abdominal segments not lobed............................. A. maritima Green