Pseudolasius trimorphus Karavaiev, 1929b: 52, fig. 7 (s.w.q.m.) INDONESIA (Java). Indomalaya.

Primary type information: Primary type material: syntype major, media, minor workers, syntype queens, syntype males (numbers not stated). Primary type localities: Indonesia: Java, Tjibodas, nos 3861, 3862, 3863 (W. Karawajew), Indonesia: Java, Buitenzorg (= Bogor), no. 2367 (W. Karawajew), Sunda Strait, nr Java, Bantam, on deck of steamship, no. 2396 (W. Karawajew). Primary type depositories: NMAS, SIZK. Primary type specimens: CASENT0917299 (w.), CASENT0917300 (q.), CASENT0917301 (m.). Type notes: 1) Kostyuk, 1976: 104, cites 92 worker, 11 queen, 13 male syntypes in SIZK. 2) Martynov & Radchenko, 2016: 252, cite 6 worker, 2 queen syntypes in NMAS (plus 113w, 218q, 1(?) m in alcohol). 3) Radchenko et al., 2025: 494, cite 84 syntype workers, 10 syntype queens, 13 syntype males in SIZK.