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Hudsonian or Dot-tailed Whiteface? - Leucorrhinia intacta - male

Hudsonian or Dot-tailed Whiteface? - Leucorrhinia intacta - Male
Fitchburg, Worcester County, Massachusetts, USA
May 29, 2007
Can anyone tell me if this is a Dot-tailed Whiteface or a Hudsonian Whiteface?

Moved from Hudsonian Whiteface. Width of spot on S7 relative to other abdominal spots makes this a Dot-tailed. ID also supported by the pale middorsal carina and smaller dark patch at the base of the hindwings.

Moved from Dragonflies.

I believe it's a Hudsonian
Juvenile and female Hudsonians are hard to separate from Dot-taileds, but the dorsal spot on segment 7 is one way. On Hudsonian the spot is large and quite triangular, as in your photo. On Dot-tails, the spot is smaller and more rounded.

And with those claspers on the end
we would say this is a young male!

To add a little confusion, I recently heard from the co-autor of 'A field Guide to the
Dragonflies and Damselflies of Massachusetts' and he said that the fact that the mark on S7 is swider than the others is typical of Dot-tailed. I'm afraid I may never know.

We stared at as many images of Whitefaces
as we could find, and we would agree with June above that the spot on segment 7 looks like Hudsonian to us, so we will move it there with your comment above attached so others will know there is still some question.

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