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Formica sp. - Formica obscuripes - female

Formica sp. - Formica obscuripes - Female
Dungeness Wildlife Reserve, Sequim, Clallam County, Washington, USA
April 27, 2006
I gather from scanning other pages that these thatching ants, which build mounds around a meter in diameter, are Formica sp. Any chance of getting to species?
There's a morph with a darker, smaller head in the photo too.
More, including a video, at Anthill Ecology.

Moved from Formica.

Thank you
Excellent. I'll get some better photos of these ants next season. They're fairly common mound builders from about sea level to at least 5500 feet.

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