The male of Dolichomitus sirenkoi Varga, 2012 is described and figured. D. sericeus (Hartig, 1847) and D. quercicolus Zwakhals, 2010 are new records for Ukraine. Cerambycidae beetles, Stenostola sp. and Plagionotus arcuatus (Linnaeus, 1758), are recorded as hosts of D. quercicolus for the first time. Additional material of Dolichomitus Smith, 1877 species, recorded from the Ukrainian Carpathians is listed. Seasonal dynamics and high-altitude zone distribution of Dolichomitus species are discussed.