Additional records of sawflies from Hainan Province with description of a new species of Caiina Wei (Hymenoptera: Tenthredinoidea).
A total of 7 genera and 8 species of sawflies are recorded from Hainan Province, China. Tenthredo malimilova and Macrophya formosana are firstly recorded from Hainan Province. The female of Ametastegia huai is also firstly reported and described. A new species of Caiina (C. nigritarsis sp. nov.) is described. The type specimen is deposited in the insect collection of the Central South University of Forestry and Technology, Hunan Province, China.