The male Scarlet Darter or Broad Scarlet is a striking sight with it's magnificent bright scarlet body and eyes.In contrast the immature male, as well as the female are yellow-brown.As the females mature they become olive in colour,so I was confused to see an all blue darter displaying a resemblance to this species when on the holiday on the Greek Island of Thassos recently.So confused in fact that I posted the following photos of this individual on an established dragonfly website to get a positive ID from those in the know.I was not disappointed as several diagnostic features were explained to me which confirmed that this very mature female darter was a blue Scarlet Darter.
However I should not be surprised as many dragonfly species display this pruinosity or 'bloom' mainly as a blue colouring , although it can take on other colours.