Abstract
Three new species of Gamasomorpha Karsch, 1881 are described: G. bakeri Tong & Hörweg, sp. nov. (♂♀) (Philippines), G. fortdekock Tong & Hörweg, sp. nov. (♂) (Indonesia), and G. jacobsoni Tong & Hörweg, sp. nov. (♂♀) (Indonesia). Additionally, Xestaspis shoushanensis Tong & Li, 2014 is recorded for the first time from Sumatra, Indonesia, and transferred to Gamasomorpha with a new combination established: Gamasomorpha shoushanensis (Tong & Li, 2014), comb. nov. Descriptions, diagnoses and photomicroscopy images are provided.