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Photo#391779
wasp - Vespula acadica

wasp - Vespula acadica
Plymouth, Plymouth County, Massachusetts, USA
May 1, 2010

Moved

Nice find!!!!
I am pretty sure this is Vespula acadica, but wait for a second opinion. I am not sure how you rule out Vespula austriaca

 
You're quite right to be cautious
Despite the good quality of this pic, telling for sure is very difficult from this angle: because neither hind tibiae nor - of course - the clypeus are visible.
I too would lean toward V. acadica, based on the rather bright yellow color of the gaster (paler with a greenish tinge in V. austriaca), but without being conclusive.

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