M a t e r i a l. Russia: District Sakhalin, Aniva; 46̊01' N 142̊52' E, 16.07.1973, 1 ǫ (Ermolenko).
D i s t r i b u t i o n. Russia (district Sakhalin, Aniva); Japan (Honshu, Kyushu) (Moriuti, 1969).
D i a g n o s i s. Wingspan 10–11 mm. Head and thorax white, dusted with pale greyochreous coloration. Labial palpi pale ochreous. Forewings grey, suffused with dark fuscous dots: a whitish costal spot before apex, and a whitish dorsal streak are diagnostic characters (fig. 2, 1). Cilia grey.
Male genitalia (fig. 2, 2–4). Valva nearly of trapezoid shape (fig. 2, 3). The arms of ventral plate as long as the length of valva (fig. 2, 4).
Female genitalia. Bursa copulatrix with signum in form of a widely spaced sclerotized formation (fig. 3, 5).
R e m a r k s. Externally resembles Argyresthia conjugella Zell., but can be readily distinguished from it by the colour of thorax, forewing pattern as well as a shape of valva in the male genitalia.
This species was unknown in Russia till now.