Abstract Two new species of Tricorythopsis Traver (Ephemeroptera: Leptohyphidae) are described based on nymphs from northern Brazil. Tricorythopsis yucupe sp. n. is distinguished by the pronotum with lateral margins expanded; forewing pads elevated just before apex and keel shaped; coxae with projections; femora with short setae; tarsal claws with three to five marginal denticles, and two rows of 1–2 + 1 submarginal denticles; dorsal tubercles present on terga 7–9; colour pattern. Tricorythopsis bahiensis sp. n. is distinguished by the wide femora bordered with long setae; tarsal claws with three or four marginal denticles, and two rows of 5 + 3–4 submarginal denticles; dorsal tubercles absent in abdominal segments; colour pattern. Duas novas espécies de Tricorythopsis Traver (Ephemeroptera: Leptohyphidae) são descritas baseadas em ninfas do norte do Brasil. Tricorythopsis yucupe sp. n. é distinguido pelo pronoto com margens laterais expandidas; extremidade das tecas alares elevadas em forma de quilha; projeção nas coxas presentes; fêmures com cerdas curtas; garra tarsal com 3–5 dentículos marginais e duas fileiras de 1–2 + 1 dentículos submarginais; tubérculos dorsais presentes nos tergos abdominais 7–9; padrão de coloração. Tricorythopsis bahiensis sp. n. é distinguido pelo fêmur largo, bordeado com longas cerdas; garra tarsal com 3–4 dentículos marginais pequenos e duas fileiras de 5 + 3–4 dentículos submarginais; ausência de tubérculos abdominais; padrão de coloração. Keywords: Leptohyphidaenew speciesnorthern Brazil Tricorythopsis Acknowledgments We are grateful to Neusa Hamada (Instituto Nacional de Pesquisas da Amazônia) for supplying part of the specimens from the northern region of Brazil, and for helping F.F.S. in collecting trips in Amazonas, Bahia, and Roraima, where the material studied in the present work was found. We also would like to thank the CNPq for providing funds to L.G.D. to conduct postgraduate studies at the Universidade Federal de Viçosa.