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Papilio troilus
Spotted near the Niagara River in a small clearing and along the trail
If this were a Black Swallowtail, Papilio polyxenes there would be a faint row of yellow dots above the blue and a second row on the forewings. Project Noah recently had all the dark swallowtail, Tiger (female dark morph, Black, Pipevine and Spicebush posted for comparison.