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The changes in coloration with age in males and females of Coeliccia mattii Phan & Kompier, 2016 from the Central Highlands of Vietnam are documented. Immature forms have extensive yellow markings on the thorax and S9 is yellowish, while in the fully mature male form, the thorax is largely black and covered in pruinosity and S9 is completely black. S9 is yellowish in the immature female while S9 is black in the fully mature female.
Eight species of the genus Prodasineura Cowley, 1934 are recorded from Vietnam, including two newly described species: Prodasineura lancastrei sp. nov. and P. kong sp. nov. from north and central Vietnam. All species recorded are illustrated, including figures of morphological structures, and distribution maps and keys to the males and females are provided. We consider the record of P. laidlawi (Forster in Laidlaw, 1907) a misidentification and exclude it here.
Part 1, Quoc Toan Phan and Van Quang To, page 1-6:
The genus Megalestes Selys, 1862 in Vietnam, with first description of female of Megalestes australis Karube, 2014 (Odonata: Zygoptera: Synlestidae)
Abstract: The male secondary genitalia and the caudal appendages of males and females of the three confirmed Vietnamese Megalestes species (M. australis, M. haui and M. micans) are figured. The female sex of M. australis is described for the first time.
Part 2, Quoc Toan Phan and Van Quang To, page 7-19:
Odonata checklist from Son Tra Nature Reserve, Da Nang city, central Vietnam
Abstract: A checklist of 44 odonate species (21 Zygoptera and 23 Anisoptera) from Son Tra Nature Reserve, central Vietnam is provided. Idionyx thailandica Hämäläinen, 1985 is recorded for the Vietnamese fauna for the first time, a new Coeliccia sp. is awaiting description in the near future, and the taxonomic status of specimens of the genus Leptogomphus remains unsettled and will have to be solved in the future.
Two new species of the genus Chlorogomphus are described based on both sexes collected from the Central Highlands of Vietnam. These species are C. hoaian sp. nov. (holotype male from Kon Ka Kinh National Park, 14.3672° N, 108.5368° E, alt. 1000 m) and C. vani sp. nov. (holotype male from Chu Yang Sin National Park, 12.4780° N, 108.4617° E, alt. 749 m). Furthermore, C. gracilis Wilson & Reels, 2001 is recorded from Vietnam for the first time, with notes on its morphology and detailed illustrations of male and female structures.
A record of male and female specimens of Sinolestes editus Needham, 1930 collected in Dak Hro village (14°19'45'' N, 108°24'23'' E, alt. 1,420m a.s.l.), Dak Roong Commune, K’Bang District, Gia Lai Province, Central Highlands of Vietnam is present with a detailed description of the morphology of these two specimens.