OMELKO M.M., OMELKO N.V.
Zoologicheskiy zhurnal 2026; 105(2): 41-49
Four species of the genus Helcystogramma Zeller, 1877 are described from the Philippines (Luzon and Mindanao Islands): H. connexa sp. n., H. bataanensis sp. n., H. zonatopalpa sp. n., and H. sororia sp. n. The new species are assigned to the trijunctum, the perelegans, and the hibisci species groups, based on the species-group classification of Helcystogramma proposed for the Chinese fauna. The new species H. connexa sp. n. (the trijunctum species group) is externally indistinguishable from H. delocosma (Meyrick, 1936), from Java and Borneo, and from H. similigena M. Omelko et N. Omelko, 2021, from Laos, but it differs well by the teardrop-shaped valvellae and the small conical branches of the sacculi bearing a tooth-like process. The new species H. sororia sp. n. (the hibisci species group) is closely related to H. ornata M. Omelko et N. Omelko, 2021, from Borneo, being similar to the latter species both in external morphology and male genitalia, but it can be distinguished by the broadly conical apex of the aedeagus, which is neither pointed nor curved hook-like. The forewings of H. bataanensis sp. n. and H. zonatopalpa sp. n. from the perelegans group are dark colored, in contrast to all previously known species of this group, whose forewing pattern is formed by silvery and orange bands and spots.
