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We synonymize Hellichiella pugach Perkovsky & Sukhomlin, 2015 with Gre­niera yankovskyi Perkovsky & Sukhomlin, 2015 (Stegopterniini) based on the holotype and female paratype of H. pugach (Stegopterniini). Hellichiella po­lessica n. sp. differs from Hellichiella oligocenica (Rubtsov, 1936) (the only species of Hellichiella known in Baltic amber) by its smaller body, narrower head, 11-segmented antenna, greater number of upper corneal facets, cylindrical metabasitarsus, and narrowed gonostylus. Our findings show three species of blackflies in Rovno amber: Greniera ukrainica Perkovsky & Sukhomlin, 2015 and G. yankovskyi Perkovsky & Sukhomlin, 2015 (Stegopterniini) and Hel­li­chi­ella polessica n. sp. (Nevermanniini).