Key to the Chinese species of formicarius ­group of Exallonyx 1. Flagellum with tyloids ......................................................... E. laevigatus Fan and He ­ Flagellum without tyloids .......................................................................................... 2 2(1). Abdominal petiole contracted at base ........................................................................ 3 ­ Abdominal petiole not contracted at base.................................................................. 4 3(2). Second flagellar segment 2.7× as long as wide; abdominal petiole 1.0× as long as deep in lateral view with six diagonal longitudinal ridges .............. E. strictus sp. nov. ­ Second flagellar segment 3.4× as long as wide; abdominal petiole 2.0× as long as deep in lateral view with four diagonal longitudinal ridges E. pingbianensis sp. nov. 4(2). First thyridium 1.8–2.0× as wide as long................................................................... 5 ­ First thyridium 2.5–3.5× as wide as long................................................................... 6 5(4). Clypeus 3.1× as wide as long; median groove on syntergite reaching 0.5 to space between tyridia, with two lateral grooves 0.67× as long as median groove ............... .............................................................................................. E. ejunicidus He and Fan ­ Clypeus 2.5× as wide as long; median groove on syntergite reaching 0.7 to space between thyridia, with two lateral grooves 0.2× as long as median groove ................ ............................................................................................. E. fujianensis Fan and He 6(4). First thyridium 2.5× as wide as long ........................... E. chiuae Townes and Townes ­ First thyridium 3.1–3.5× as wide as long................................................................... 7 7(6). Upper margin of pronotum with 2 rows of setae .................... E. fuliginis He and Fan ­ Upper margin of pronotum with single row of setae ......... E. nigricornis He and Fan

Published as part of Liu, Jingxian, He, Junhua & Xu, Zaifu, 2006, Two new species of Exallonyx Kieffer (Hymenoptera: Proctotrupidae) from China, with a key to the Chinese species, pp. 35-41 in Zootaxa 1142 on pages 40-41, DOI: 10.5281/zenodo.273403