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Formica obscuripes [Thatch ant]

USA, CA, Nevada Co.: Sagehen Creek Field Station, 13.vii.2004, 39Âº26'N 120Âº14'W, 1920m, Lodgepole Pine forest/wet meadow, #AW2425, voucher specimens deposited at ALWC and MHNG.

"Worker polymorphism in the mound ant Formica obscuripes. These ants are sisters from the same nest."