Two new species, Eutrichosiphum nasensis sp. nov. and Greenidea kheemoticola sp. nov., and two new records, Greenidea eugeniae Takahashi 1941 and Schoutedenia ralumensis Rübsaamen 1905, belonging to the subfamily Greenideinae Baker 1920 are described from Laos. E. nasensis sp. nov. is distinguished by unique abdominal pigmentation and the relative length of ultimate rostral segment and 2nd tarsal segment. G. kheemoticola sp. nov. is characterized by the relative length of siphunculus and the maximum width of same segment. Illustrations for above 4 species and identification key to all the species from Laos for apterous viviparous females are provided.