Zyxomma petiolatum, Ratmalana, Sri Lanka (Dingy Duskflyer)
Fairly certain that this is Zyxomma petiolatum. I have used Bedjanic et als Dragonfly Fauna of Sri Lanka and another book by Gehan De Silva Wijeyaratne.
Having trouble setting the species. Wikepedia link is here, https://en.wikipedia.org/wiki/Zyxomma_petiolatum
Zyxomma petiolatum, known by the common names longtailed duskdarter, brown dusk hawk and dingy duskflyer, is a species of dragonfly in the family Libellulidae.[3][4] It is widespread in many Asian countries, and north-eastern Australia.
Similar species: Dragonflies And Damselflies
By ShanelleAW
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Uploaded Aug 18, 2018. Captured Aug 12, 2018 01:47.