Key to Chinese species (♂) of Tambocerus

1. Pygofer caudal lobe rounded with posterodorsal margin serrate........................................ T. dentatus

- Pygofer caudal lobe produced into spine-like process, with or without serrations................................... 2

2. Posterior process of pygofer long, spinelike................................................................ 3

- Posterior process of pygofer short, cap-like....................................................... T. elongatus

3. Posterior process of pygofer curved dorsally............................................................... 4

- Posterior process of pygofer either directed posteriorly or posteriorly and then ventrally............................. 5

4. Posterior process of pygofer with serrations........................................................ T. furcellus

- Posterior process of pygofer without serrations................................................. T. quadricornis

5. Posterior process of pygofer curved ventrally............................................................... 6

- Posterior process of pygofer directed posteriorly............................................................ 7

6. Aedeagal shaft with pair of slender apical processes extended anteroventrad.......................... T. longicaudatus

- Aedeagal shaft with pair of short posterolateral projections at apex................................... T. triangulatus

7. Aedeagal shaft parallel-sided in posterior view, with small apical lamellae............................ T. robustispinus

- Aedeagal shaft widened near midlength in posterior view, with pair of acute apical processes....... T. fanjingensis sp. nov.