Gruncle is a small metallic green fly with long yellow legs and large green eyes. Black markings are near the tips of the transparent wings.
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Gruncle is a Long-legged Fly in the Order of “true flies” (Diptera) and ambiguously identified in the Family of Dolichopodidae. Nothing further can be identified from the DNA sequence of COI. The coloration and wing markings make it seem like a Green Long-Legged Fly (Austrosciapus connexus) but this does not pan out since that fly is native to Australia. Using reference images at BugGuide, it would appeear that Gruncle is of the Condylostylus sipho group, which are located in the Northeast.