Chydaeus irvinei

Kataev, Boris M., Wrase, David W. & Schmidt, Joachim, 2014, New species of the genus Chydaeus from China, Nepal, Myanmar, and Thailand, with remarks on species previously described (Coleoptera: Carabidae: Harpalini), Zootaxa 3765 (1), pp. 1-28 : 18

The irvinei species group

Diagnosis. Body comparatively small, length less than 8 mm. Elytra fused along suture, with parascutellar strioles rudimentary or absent; basal setigerous pores absent; preapical sinuations of elytra obsolete. Metepisterna wider than long, slightly narrowed posteriad. Tergite VII (last visible) of female rounded at apex. Metacoxae each with an additional posteromedial setigerous pore. Median lobe of aedeagus with short terminal lamella and without apical capitulum.