Key to Andricus species of Taiwan

1 Anterior half of mesoscutum distinctly sculptured, delicately coriaceous to alutaceous; F1 of male antenna slightly curved and swollen apically, 1.8 times longer than pedicel......................................................... songshui

- Mesoscutum alutaceous to smooth, glabrous, without distinct surface sculpture anteriorly; F1 of male antenna stronly curved and swollen apically, 2.8–3.0 times longer than pedicel....................................................... 2

2 Head black anteriorly, malar area with striae; frons smooth shiny or very delicately alutaceous; distance between antennal toruli slightly larger than diameter of torulus; prominent part of ventral spine of hypopygium 6.0 times longer than broad; male predominantly black....................................................................... pseudocurvator

- Head brown anteriorly, especially lower face; malar area without striae, frons with distinct alutaceous sculpture; distance between toruli distinctly shorter than diameter of torulus; prominent part of ventral spine of hypopygium around 3.0 times longer broad; males light brown.................................................................... formosanus