Three species of the aulacid genus Pristaulacus Kieffer are now known from the Philippines: P. erythrocephalus Cameron, P. bakeri, n. sp., and P. sibuyan, n. sp. The species are described and illustrated and a key is given for their separation. Two species of Pristaulacus were previously known from Borneo, both from the northern Malaysian state of Sarawak: P. erythrocephalus and P. fasciatipennis (Cameron). Additional records are given for these species, and P. iridipennis (Cameron) is newly recorded from Borneo (Malaysia: Sabah). Pristaulacus erythrocephalus is also recorded from the Malaysian Peninsula (Pahang).