Key to species of Omineus in Taiwan

1. Elytral pattern not comprising whitish or yellowish elongate setae........................... O. humeralis Lewis, 1895

- Elytral pattern comprising whitish to yellowish elongate setae.................................................. 2

2. Abdomen orange; posterior pronotal margin reddish brown medially in males, otherwise reddish brown with medial region lighter; body larger (5.0–6.0 mm); elytral pattern consisting of two, paired sutural patches and three, paired marginal patches; sutural and marginal patches separated................................................... O. taiwanensis sp. nov.

- Abdomen dark brown; pronotum blackish brown in male, median part of anterior and posterior margins reddish brown; body smaller (3.7–3.8 mm); elytral pattern consisting of three, paired sutural patches and three, paired marginal patches; median sutural and marginal patches contiguous.................................................... O. chuangae sp. nov.