Key to species of Pseudacerus

1 Posterior angle of elytra protuberant. Elytra and pronotum with long setae throughout, setae on elytra more than twice as long as diameter of large punctures of isodiametric structures. Trichomes on first visible paratergites large, longer than maximum width of paratergites. Three long and narrow macrosetae-like trichomes slightly curved, not tangled. Body length 1.4–1.5 mm ..................................................................................... P. sabahensis sp. n.

- Posterior angle of elytra simply carinate, not protuberant. Elytra and pronotum with long setae only in lateral half, elsewhere setae shorter, at most 1.5 times as long as diameter of large punctures of isodiametric structures. Trichomes on paratergites small, not longer than maximum width of paratergites. Two long and narrow, macrosetae-like trichomes tangled. Body length 1.35 mm ............................................................................... P. furcatus Raffray