Key to the Chinese species of genus Biroia Szépligeti

1. Head and mesosoma yellowish red (Fig. 16); ovipositor sheath wide (Fig. 22). Body length 10.0–11.0 mm. China (Yunnan, Hainan); Indonesia; Philippines .................................................... B. taeniocauda (Enderlein)

- Head and mesosoma black (Figs. 1, 8); ovipositor sheath narrow (Figs. 1, 8)....................................... 2

2. Metapleuron and hind coxa sparsely setose (Fig. 4); vertex without a longitudinal furrow posteriorly (Fig. 6); spurs of middle and hind tibiae black (Fig. 3). Body length 9.4 mm. China (Zhejiang) B. baishanzuensis sp. n.

- Metapleuron and hind coxa with velvety and silvery setae (Fig. 9); vertex with a distinct longitudinal furrow posteriorly (Fig. 11); spurs of middle and hind tibiae pale yellow (Fig. 15). Body length 8.9 mm. China (Fujian)........... B. hirsutus sp. n.