Key to species of Micropeplus Latreille of Sichuan.

1. Elytra impunctate......................................................................................................................................... M. piankouensis sp. nov

. Elytra punctuate ..................................................................................................................................................................................2

2. Body larger, 1.8–2.7 mm, tergite 7 of abdomen with three carinae at base of tergite..........................................................................3

Body smaller, 1.5–1.6 mm, tergite 7 of abdomen with one carina at base of tergite ............................................ M. parvulus sp. nov.

3. Aedeagus with symmetric parameres..................................................................................................................................................4

Aedeagus with asymmetric parameres................................................................................................................................................5

4. Median lobe relatively short and strongly narrowed in apical third towards the apex .................................... M. nomurai Watanabe

Median lobe relatively long and tapered in apical third towards the apex ........................................................... M. uenoi Watanabe 5. Right paramere widened strongly in apical third and with one long and one short subapical setae, left with two long ones................ .................................................................................................................................................................. M. songi Zheng, Li & Yan

Right paremere widened slightly in apical third and only with one short seta, left with a short one ....... M. xiaoae Zheng, Yan & Li