EN
Genus Lithoaphis Takahashi, 1959 is reported from China. One new species Lithoaphis quercisucta sp. nov. from Yunnan Province, China is described. Diagnosis character, key of species, distribution, host plant and biology of the genus Lithoaphis are provided. Morphological description, feature pictures, distribution, and host plant of the new species are included in this paper. All specimens including the type are deposited in the Zoological Museum, Institute of Zoology, Chinese Academy of Sciences, P. R. China.