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.
Conaspidia qinlingia Wei sp. nov. and C. wangi Wei sp. nov. are described from China. Characters of Conaspidia bicuspis group are briefly discussed and a key to the species of the group is provided. Conaspidia murotai Togashi, 1984 and Conaspidia ishikawai Togashi, 2005 are new synonyms of Conaspidia guttata （Matsumura, 1912）, the latter is briefly redescribed and illustrated. A key to Japanese species of Conaspidia is also provided.
