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From Phyllonorycter salictella (Zeller,1846) a sister species P. heringiella (Grönlien, 1932) is here extracted on the basis of the number and colour of costal strigulae at the tip of the wing and the brightness of the golden coloration of the forewing. P. salictella is reported from the Finnish biogeographical provinces AI, Ab, N, Ka, Ta, Kl, Oa, Tb, Om, Oba, and Obb and P. heringiella from Al, Ab, N, Ka, Ta, Sa, and Oba. It is assumed that the golden hue, which sometimes covers the normally white strigulae of the forewing, occurs in freshly emerged moths and disappears after first flying efforts.

The Finnish Endothenia sp. called E. gentianaeana (Hübner) for more than a hundred years is shown to be E. oblongana (Haworth), a species occurring also in the other Nordic countries. To our knowledge, E. marginana (Haworth) has a discontinuous distribution in Finland, Sweden, and East Karelia. On the basis of the distribution and differences in appearance a new subspecies Endothenia marginana tarandina ssp. n. is described, with data on its biology.

The female of Elachista leifi Kaila & Kerppola is described based on two females collected in northern Finland. In addition to the larger size; the almost black ground colour, the small light area at fringe at the tip of the forewing and the bluish lustre on the underside of the thorax are the best diagnostic characters. The female genitalia of the species can be separated from those of other closely related species, except E. kilmunella, by the shape of antrum, the teeth of ductus bursae and the size and shape of signum. We did not find any reliable differences in female genitalia between E. kilmunella and E. leifi, due to variation in the characteristics of E. kilmunella.