Key to Japanese species of Dactylolabis 1. Wing without dark markings except for indistinctly dark stigma (Fig. 4C); hypopygium with outer gonostylus stout and bacilliform, inner gonostylus strongly curved near middle (Fig. 4H).................................. D. longicauda - Wing with distinct dark areas except for stigma (Figs 1B, 3B); outer gonostylus slender, finger-shaped, inner gonostylus weakly curved near tip (Figs 1G, 3G)............................................................................ 2 2. Prescutum and presutural scutum with four dark stripes; femora and tibiae dark brown except yellow femoral bases; gonocoxite 2.2 times as long as wide or more, basal and apical part almost same in width (Fig. 3F); interbase with middle part broadened into squarish plate (Fig. 3H).............................................................. D. kyororo sp. nov. - Prescutum and presutural scutum with one or two indistinctly dark stripes; femora and tibiae dark brown distally, gradually turning into yellow toward each base or each tip narrowly dark; gonocoxite 1.7 times as long as wide or less, apparently widest on basal part (Fig. 1F); interbase with middle part narrow, without squarish plate on middle part (Fig. 1H)......... D. diluta

Published as part of Kato, Daichi, 2023, Taxonomic study of the genus Dactylolabis Osten Sacken, 1860 of Japan (Diptera: Limoniidae), pp. 227-240 in Zootaxa 5375 (2) on page 228, DOI: 10.11646/zootaxa.5375.2.4, http://zenodo.org/record/10184348