Key to the species of Triberta based primarily on phenotypic characters of adults, male and female genitalia and on larval host plants

1. Vertex of head whitish with slight brownish suffusion posteriorly; in the male genitalia, valva slender, bar-shaped, its median width never greater than a quarter of its length; caudal part of sternum VIII sharply triangular; in the female genitalia, signum of corpus bursae round, as big as ca. 63×56 µm; host Cistus sp. (Figs 16, 22, 23, 60)..................... T. cistifoliella

- Vertex of head brown anteriorly and whitish posteriorly; in the male genitalia, valva with central part enlarged, its median width never less than one third of its length; caudal part of sternum VIII broadly roundish; in the female genitalia, signum of corpus bursae not round, as big as ca. 32×21 µm; host Helianthemum sp. (Figs 17–19, 21; 24, 25, 61)..... T. helianthemella