The species of Siobla Cameron from Tibet, China are investigated. Four new species are described：Siobla albomaculata Niu Wei sp. nov., S. chayuica Niu Wei sp. nov., S. muotuoensis Niu Wei sp. nov.,and S. unicincta Niu Wei sp. nov. A key to the 11 known species of Siobla from Tibet is provided.
In the genus Macrophya, the annulitibia group is proposed to include five species from China, lnala and Japan. Two new species belonging to this species group are described from China： Macrophya shengi Li ＆ Chu sp. nov. from Sichuan and Macrophya xinan Li ＆ Liu sp. nov. from Tibet and Sichuan. Descriptions and illustrations are given to separate them from the other species of the annulitibia group. A key to all known species of the annulitibia group from China is provided. Type specimens are deposited in the Insect Collection of Central South University of Forestry and Technology, Changsha, Hunan, China.
