Identification key to the species of Dichillus from Thailand

1 Smaller species, body length 2–3.2 mm, upper margin of epipleura sharp......................................... 2

- Larger species, body length 4.2–4.5 mm, upper margin of epipleura indistinct..................................... 3

2 Body length 2 mm, elytra flat and long elongate, antennae long and narrow, antennomeres quadrate, elytral intervals three and five without traces of costae..................................................................... D. chujoi

- Body length 3.2 mm, elytra convex and round-oval, antennae short and broad, antennomeres distinctly broader than long, elytral intervals 3 and 5 with costae............................................................ D. grimmi sp. n.

3 Lateral margins of pronotum finely beaded; elytral intervals three and five in anterior third of elytra and interval seven completely elevated, nearly keel-like............................................................. D. kuschstaberi

- Lateral margins of pronotum lacking; all elytral intervals flat, not elevated......................... D. siamicus sp. n.