Grey-chested Flatwing, probably Griseargiolestes eboracus. Heathcote National Park, NSW Australia, October 2012.
According to Theischinger and Hawking, The complete field guide to dragonflies of Australia, Griseargiolestes eboracus has the mesepimeral portion of its humeral stripe about as wide as the adjacent part of the episternal portion. My uncertain interpretation of that is: the top yellow stripe running from the damselfly neck towards its bum has a fine black line running diagonally through it that divides the stripe into two yellow parts. One yellow part is lower and at the rear, the other yellow part is higher and joins the neck. For this damselfly (Griseargiolestes eboracus), where these stripes are next to each other, their thicknesses should be similar. In comparison, the Grey Flatwing, Griseargiolestes griseus has the mesepimeral portion of its humeral stripe much wider than the adjacent part of the episternal portion, or, the bottom rear part will be much thicker than the nearby upper part.
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