Two new dendrothripine Thripidae are described and illustrated from Japan. Petrothrips nigriceps gen. et sp. nov. is described from the Izu Peninsula, and Dendrothrips amamiensis sp. nov. from Amami I. in the Ryukyu Islands. The genus Petrothrips is closely related to Edissa Faure, 1953 and Asprothrips Crawford, 1938. Dendrothrips amamiensis is closely related to D. sexmaculatus Bagnall, 1916.
