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Argyresthia flexilis is a moth of the Yponomeutidae family. It is found in the United States in northern Montana and probably the adjacent parts of Canada.

Argyresthia flexilis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Yponomeutidae
Genus: Argyresthia
Species: A. flexilis
Binomial name
Argyresthia flexilis
Freeman, 1960[1]

The wingspan is about 11 mm. The forewings are yellowish-white and the hindwings are smoky. Adults are on wing in late June.[2]

The larvae feed on Pinus flexilis.[3] Late instar larvae tie needles into a bundle and mine two or more of them, starting below the middle of the needle, and mining toward the apex. The frass is ejected through the mine entrance. Full-grown larvae construct a new bundle within which pupation takes place in a dense, white cocoon.

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