Abstract
A key is given to 14 species of Scolytidae and 1 species of Platypodidae known to occur in Tonga. New synonymy is proposed as follows: Hypocryphalus mollis (Schedl) (= Hypocryphalus tongaensis Schedl), Eccoptopterus spinosus (Olivier) (= Xyleborus eccoptopterus Schedl). Hypocryphalus mollis (Schedl) comb. nov. is transferred to Hypocryphalus from Cryphalus; Liparthrum tongatapui (Schedl) comb. nov. is transferred to Liparthrum from Mimiophthorus. The distribution, biology, and potential economic importance of the species are discussed.