Key to species of Pseumenes occurring in the Philippine Islands

1 Vertex strongly swollen, posterior margin protruding (Fig. 12); T3 and T4 with well developed apical lamella (Fig. 13); body almost entirely smooth and shining, only sparse and shallow punctures confined to frons, T2 and S3–S4; black with extensive yellow markings ....................................................................................................................................... P. polillensis (Giordani Soika)

- Vertex less strongly swollen, posterior margin not protruding; T3 and T4 without apical lamella; body extensively punctured; body almost entirely black, with little pale yellow markings............................................................................................................ 2

2 Scutellum, metanotum, propodeum and mesepisternum smooth, with extremely fine and ill-defined punctures (Fig. 4); apical lamella of T2 not very distinct, similar to a weak reflexing of apical margin of tergum (Fig. 3); wings extremely dark, almost opaque black, with strong bluish reflections .................................................................................................... P. azurescens sp. nov.

- Scutellum, metanotum, propodeum (Fig. 9) and mesepisternum with well impressed and deep punctures; apical lamella of T2 distinct, separated from rest of the tergum by a deep furrow and strongly bent upward (Fig. 10); wings brownish-transparent with very weak golden reflections ............................................................................................................ P. palawanensis Giordani Soika