A review of Microdytes J. Balfour-Browne, 1946 from Thailand, Laos, and Cambodia with descriptions of five new species and new records (Coleoptera, Dytiscidae) Author Okada, Ryohei https://orcid.org/0000-0002-8488-0660 Thailand Natural History Museum, National Science Museum, Technopolis, Pathum Thani, Thailand & Coleopterological Society of Japan, National Museum of Nature and Science, Tsukuba, Japan wasserinsekt@kub.biglobe.ne.jp Author Jaitrong, Weeyawat https://orcid.org/0000-0003-1362-0754 Thailand Natural History Museum, National Science Museum, Technopolis, Pathum Thani, Thailand Author Wewalka, Guenther https://orcid.org/0000-0002-2994-8001 Starkfriedgasse 16 / 1 / 3, A - 1190 Vienna, Austria text ZooKeys 2023 2023-04-25 1159 87 119 http://dx.doi.org/10.3897/zookeys.1159.99218 journal article http://dx.doi.org/10.3897/zookeys.1159.99218 1313-2970-1159-87 CD97DD120549412F976508D8DE21605B ECCECB868071523DB7628E304850BD62 Microdytes schwendingeri Wewalka, 1997 Figs 34 , 40B Microdytes schwendingeri Wewalka, 1997: 36; Wewalka 2011 : 37; Nilsson and Hajek 2023 : 212. Type locality. Thailand, Sakon Nakhon Province, Phu Pan NP. Material examined. Thailand : Nakhon Phanom Province . 1♂ , 1♀ , Bang Phaeng District , Phai Lom St. 203 (alt. 200 m ), 27.XII.2020 , R. Okada leg. (CRO, THNHM) (Fig. 34 ) . Laos : Savannakhet Province , 1♀ , Phou Xang He NBCA, ca. 5 km SW Ban Pa Phaknau , 17°00'N , 105°38'E , alt. 250-400 m , 31.V.-6.VI. 2011 , NHMB Basel , Laos 2011 Expedition, M . Brancucci, M . Geiser, D . Hauk, Z . Kraus, A . Phantala & E. Vongphachan leg. (NMB); Champasak Province . 2♂♂ , 1♀ , Bolavens Plateau , waterfall ca. 2 km E Tad Katamtok , 15°08.1'N , 106°38.8'E , alt. 415 m , 10.-12.V.2010 , J. Hajek leg. (CGW, NMP) . Comments. Some specimens from Laos have less distinct elytral markings but no other differences from typical specimens have been observed. Distribution. Thailand: Nakhon Phanom (first record) and Sakon Nakhon provinces; Laos (first record): Savannakhet and Champasak provinces.