Previously unpublished Odonata records from Sarawak, Borneo, part IV: Bintulu Division including the Planted Forest Project and Similajau National Park

Records of Odonata from Sarawak's Bintulu Division are presented. One hundred and sixtysix (or more) species are listed, of which three (Oligoaeschna amata (Forster, 1903), O. buehri (Forster, 1903) and Oligoaeschna (?) species) had not previously been recorded in Sarawak and Macromia species cf dione Lieftinck, 1971 had not previously been recorded from Borneo. Additionally this is the first published record of Prodasineura tenebricosa Lieftinck, 1937 from Sarawak, although it had been found at another location in the state prior to its discovery in Bintulu, and the first published record of Phyllothemis raymondi Lieftinck, 1950 from Borneo, although specimens from Kalimantan are present in the collections of the Naturalis Biodiversity Center, Leiden. Other notable records include "Elattoneura" longispina Lieftinck, 1937, Pericnemis dowi Orr & Hamalainen, 2013, Linaeschna polli Martin, 1909, Burmagomphus arthuri Lieftinck, 1953, Heliogomphus borneensis Lieftinck, 1964, Merogomphus femoralis Laidlaw, 1931, Chlorogomphus species, Macromidia genialis erratica Lieftinck, 1948 and Tetrathemis flavescens Kirby, 1889. Altogether there do not appear to be any previous published records from Bintulu Division of 52 of the species listed in this paper. The status of Rhyothemis fulgens Kirby, 1889 is discussed and illustrations of its anal appendages and those of R. pygmaea (Brauer, 1867) are provided. Illustrations of the anal appendages of Tetrathemis hyalina Kirby, 1889 and T. irregularis Brauer, 1868 are also provided. Identification problems when using COIbased DNA barcoding with some species of Archibasis are discussed, and the nuclear marker ITS is shown to be a successful alternative in these cases; COI and ITS gene trees for part of the genus are included. Some COI data for Macromia species are published and the marker is used to identify larvae of M. corycia Laidlaw, 1922 and establish the relationship of another Macromia larva with M. dione, a very poorly known species from Sumatra. Macromia euterpe Laidlaw, 1915 is considered to be the same species as M. westwoodii Selys, 1874 and dropped from the list of species known from Sarawak, however formal combination of the two species is left for a peer reviewed publication. A detailed list of previously unpublished specimens from the locations covered is given in an appendix. Concise checklists for two of the locations covered Similajau National Park (54 species) and the Bukit Mina Wildlife Corridor (84 species) are given in another appendix.