According to the pictures, it is a pair of Aegolipton marginale (Fabricius, 1775). Another new species occurring also in Hainan island has just been described (A. meiyingae Drumont & Bi, 2015) close to this species but very different by having strong black costa on elytra.
Another new species occurring also in Hainan island has just been described (A. meiyingae Drumont & Bi, 2015) close to this species but very different by having strong black costa on elytra.