Two new species of the subfamily Greenideinae, Greenidea sp. nov. and Eutricosiphum sp. nov., are newly recognized from Laos on Glochidion fagifolium Bedd. (Malpighiales: Phyllanthaceae) and Quercus sp. (Fagales: Fagaceae), respectively. They are described and illustrated in comparison with congeneric species for apterous viviparous females. Greenidea sp. nov.is mainly characterized by relative length of siphunculus and width of same segment, and Eutricosiphum sp. nov. is distinguished by the relative length of ultimate rostral segment and 2nd hind tarsal segment.

• Yerim Lee(Laboratory of Insect Biosystematics, Department of Agricultural Biotechnology, Seoul National University, Research Institute of Agriculture and Life Sciences, Seoul National University)
• Seunghwan Lee(Laboratory of Insect Biosystematics, Department of Agricultural Biotechnology, Seoul National University, Research Institute of Agriculture and Life Sciences, Seoul National University)