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General Description"Wingspan 11-14 mm. Head golden white, frons shining brassy white; antenna distinctly annulated with dark brown and whitish, scape pale ochreous; labial palpus golden white. Thorax golden-white, tegulae golden. Forewings with Veins R4 and R5 separate; apical markings coarse; Forewings white suffused with pale golden; a square golden spot on dorsum connected to base by a broad streak astride fold, sometimes extended with irroration beyond spot in middle of wing; a broader gold mark on dorsum at halfway extended obliquely across half to three-quarters of wing; a gold spot at tornus, sometimes extended by irroration into apical area; cilia generally concolorous with adjacent part of wing. Hind wing grey, darker towards apex. Legs brassy white; forewing brown above. Abdomen grey" (Emmet et al 1996: 80-81; Busck, 1907: 13; Forbes 1923: 386). Busck (1907: 13) points out that "Specimens from B.C. and Seattle do not differ from European Series", and Forbes (1923: 346) indicates "If the American form is distinct, its name will be chalcochrysa Meyrick". In Alberta, A. pygmaeella can be easily distinguished from other Argyresthia by its forewing color and pattern. Closely similar to this species is A. conjugella which does not have the golden color on forewings.