Previously unpublished Odonata records from Sarawak, Borneo, part X: Maludam and Ulu Sebuyau National Parks

Previously unpublished records of Odonata collected during surveys at Maludam National Park (MNP) in 2018 and Ulu Sebuyau National Park (USNP) in 2015 are presented. Both protected areas are situated in the southwest of Sarawak and consist of peat swamp forest (PSF), a habitat that has declined dramatically in extent in southeast Asia in recent decades. Probably the most significant result of the surveys was the discovery of a population of the extremely poorly known Pseudagrionoptera diotima Ris, 1912 in MNP. Other significant records include Podolestes chrysopus Selys, 1889, Podolestes parvus Dow & Ngiam, 2019, Pachycypha aurea Lieftinck, 1950, Elattoneura longispina Lieftinck, 1937, Ceriagrion new sp., Mortonagrion sp. cf aborense (Laidlaw, 1914), Metaphya micans Laidlaw, 1912 and Raphismia inermis Ris, 1910. With these records 62 species of Odonata are now known from MNP and 33 species are known from USNP. Checklists are given for the two areas in Appendix 1 and Appendix 2. The differences between numbers of species known from the two areas are partly explained by differences in sampling effort and a lack of running water habitats in the sampled part of USNP, but there is a somewhat surprising lack of swamp forest specialist or near specialist Libellulidae in the checklist for USNP. The proportion of species that are currently classified as Endangered, Vulnerable or Near Threatened on the IUCN Red List is high at both locations – ca. 29% at MNP, ca. 21% at USNP. Species that we consider to be specialists of low pH waters are listed.