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Drepanosticta kosterini sp. nov. (holotype ♂, from Gunung Penrissen, Kuching Division, Sarawak, Malaysian Borneo, deposited in RMNH) is described from both sexes. It is the sister species of D. actaeon Laidlaw, 1934; a fresh description of the male of D. actaeon and the first description of the female are given, along with discussion of variation in this species. Both D. actaeon and D. kosterini are considered to belong to a species group also including D. rufostigma (Selys, 1886) and a preliminary discussion of variation in this species is given, along with illustrations of both sexes. A neighbour joining COI gene tree for D. actaeon and D. kosterini is presented. The relationships of D. actaeon, D. kosterini and D. rufostigma to other members of the Platystictidae are briefly discussed.
Results of a collecting trip to the Samunsam Wildlife Sanctuary in western Sarawak are presented. Several species are reported from Sarawak for the first time: Elattoneura coomansi, Mortonagrion cf aborense, Macrogomphus phalantus and Pornothemis starrei. Other notable records include Coeliccia species, Prodasineura cf interrupta and Raphismia bispina.
New records of Odonata from three of Sarawak’s administrative divisions are presen-ted: Sri Aman, Sibu and Kapit. Idionyx montana is recorded from Borneo for the first time, from Batang Ai National Park in Sri Aman Division. Other notable records include: Podolestes species, Matronoides cyaneipennis, Rhinoneura caerulea, Dysphaea species, Coeliccia campioni, Acrogomphus jubilaris, Procordulia fusiformisand Orthetrum borne-ense.
Records of Odonata from two areas in the upper Baram area in Sarawak's Miri Division are presented. Sixty five species are recorded from the Sungai Sii area and sixty three from the Ulu Moh area. Notable records include Telosticta ulubaram, Coeliccia southwelli, Leptogomphus new species, Macromia corycia and Tramea cf. virginia. Rhyothemis regia is recorded from Sarawak for the first time.
Records of Odonata from Kubah National Park, near Kuching in west Sarawak, are presented. Eighty-five species are known from the national park. Notable records include Drepanosticta drusilla, Rhinocypha species cf spinifer, Bornagriolestes species, Anaciaeschna species and Macromidia genialis erratica.
Records of Odonata from the Lanjak Entimau Wildlife Sanctuary (LEWS) in Sarawak, Malaysian Borneo are presented. Previous records of Odonata from LEWS are critically examined. One hundred and ten species have been recorded within the sanctuary, including three that have yet to be found outside (Drepanosticta adenani, Telosticta iban and "Elattoneura" mauros); records of four more species are regarded as in need of confirmation, those of another six are incorrect. In addition to the three species only known from LEWS, other notable records include: Drepanosticta sbong, Dysphaea lugens, Euphaea sp. cf basalis, Pericnemis kiautarum, Burmagomphus insularis, Gomphidia caesarea, Merogomphus species, Phaenandrogomphus safei, Macromia callisto and Idionyx montana. A fresh illustration of the anal appendages of Drepanosticta sbong in lateral view is provided to make up for inaccuracies in the original illustration. The taxonomy of Phaenandrogomphus safeii is briefly discussed. Zygonyx errans Lieftinck, 1953 is considered a subspecies of Z. ida not Z. iris Additional records from areas adjacent to LEWS are given in an appendix.
The results of two expeditions into the Ulu Baleh and Ulu Balui areas of the interior of Sarawak are presented, including data from forest that was pristine at the time of sampling but that was subsequently logged. A total of 74 species are recorded, notably including Coeliccia campioni, Coeliccia new species borneensis-group, Pericnemis spp., Heliogomphusblandulus, Leptogomphus pendleburyi, Chlorogomphus ?manauand Procordulia ?new species. A discussion of the results and potential differences in the odonate fauna of comparable logged and unlogged forest sites is given.
Odonata recorded during two brief sampling trips to the Kapit Town area in Kapit Division, Sarawak in 2020 are reported on. Seventy nine species were recorded, of which at least six (Onychargia atrocyana Selys, 1865, Ischnura senegalensis (Rambur, 1842), Pseudagrion lalakense Orr & van Tol, 2001, Megalogomphus borneensis (Laidlaw, 1914), Agrionoptera insignis (Rambur, 1842) and Hydrobasileus croceus (Brauer, 1867)) are first records for the division, bringing the total number of Odonata known from the division to 160. Notable records include Coeliccia kenyah Dow, 2010, Teinobasis laidlawi Kimmins, 1936, Burmagomphus insularis Laidlaw, 1914, Leptogomphus sp. cf coomansi Laidlaw, 1936 and Macromia callisto Laidlaw, 1922. Remarks are made on the habitat preferences of Agrionoptera insignis and Camacinia gigantea (Brauer, 1867). A highly atypical population of Neurothemis Brauer, 1867 (species unclear at present) is reported.
Records of Odonata collected in Gunong Mulu National Park in Sarawak are presented. Between 2005 and 2019, in 12 surveys that lasted between one week and five months, 163 species were collected. The collections from Gunong Mulu National Park are of importance for the taxonomic study of dragonflies and damselflies in Borneo; several species have been described based on material collected in the Park.