Hesperopenna vietnamica group.

Body length 5.1 – 7.1 mm. Body completely yellow or with tibiae, tarsi and/or head black. Antennomere III about 1.5 – 3.0 times longer than anntenomere II. Pronotum transverse, 1.6 – 1.8 times as wide as long, finely punctate. Elytra glabrous. Aedeagus dorsally with two thin lateral processes, incision between them very deep, reaching basal third of aedeagus, ventral side apically with or without hook-like process (Fig. 66).

Species included. Hesperopenna vietnamica (Medvedev, 2000) (comb. nov.), H. thailandica (Kimoto, 1989) (comb. nov.) and at least four undescribed species.