Key to males of the P. guangxiensis group

1. Pronotum with three pairs of black marks (Fig. 6); 9th tergum with posterolateral portions slightly produced, and with posterior margin slightly incised (Fig. 7); tip of 10th sternum with bifurcate lateral lobe (Fig. 10) .......................................................................................................................... P. furcatus sp. nov.

- Pronotum with two pairs of black marks (Figs. 13, 20, 25, 30); 9th tergum with posterolateral portions strongly produced, and with posterior margin truncate or elevated (Figs. 14, 21, 26, 31); 10th sternum with lateral lobe digitiform but not bifurcate at tip (Figs. 17, 24, 29, 34) ...................................................2

2. Legs with tibiae mostly dark.......................................................................................................................3

- Legs with tibiae mostly yellow....................................................................................................................4

3. Pronotum with two pairs of wide black vittae, almost connected at midlength (Fig. 13); 10th tergite in caudal view suboval with ventral process slightly curved medially (Fig. 16) ............................................... ....................................................................................................................... P. guangxiensis Yang & Yang

- Pronotum with two pairs of black vittae narrow and widely separated (Fig. 30); 10th tergite in caudal view round with ventral process strongly curved medially (Fig. 33) .......................................... P. zhuae sp. nov.

4. Head without black marks (Fig. 20); 9th sternum with shallow posterior incision (Fig. 22); 10th tergite in caudal view with ventral process short (Fig. 23) ..................................................... P. impunctatus sp. nov.

- Head with four pairs of black marks, two large, two small (Figs. 25); 9th sternum with deep posterior incision (Fig. 27); 10th tergite in caudal view with ventral process long (Figs. 28) ...... P. piaoacanus sp. nov.