Revision of the Nearctic species of Ditomyia Winnertz and a new species from the Neotropical Region (Diptera: Ditomyiidae) Author Fitzgerald, Scott J. text Zootaxa 2020 2020-10-06 4859 2 239 262 journal article 8213 10.11646/zootaxa.4859.2.4 efffbbf9-8fdd-484c-a9c2-933659495b1a 1175-5326 4412963 19608730-D202-4863-AF29-742F9B791732 Key to the species of Nearctic Ditomyia 1 Wing patterned ( Figs. 2 & 11 ); male terminalia as Figs. 13–15 and female terminalia as Fig. 16 ; eastern Nearctic…............................................................................................... D. euzona Loew - Wing hyaline; terminalia not as above…................................................................... 2 2 Antennal flagellomeres pale yellow (sometimes becoming light greyish-brown distally), nearly concolorous with pale yellow pedicel and scape, black spot marking base of each antennal seta strongly contrasting against yellow background color of flagellomere ( Fig 5 ); mesonotum black to very dark brown ( Fig. 19 ); male terminalia as Figs. 20–22 , female terminalia as Fig. 23 ; eastern Nearctic…...................................................................... D. potomaca Fisher - Antennal flagellomeres grey-brown, contrasting with pale yellow scape and pedicel, black spot marking base of each antennal seta not strongly contrasting against background color of flagellomere ( Fig. 6 ); mesonotum pale yellow with light brown stripes ( Figs. 7 & 24 ); western Nearctic…........................................................................ 3 3 Macrotrichia of wing evenly distributed on basal third (cell br+bm with evenly spaced macrotrichia) ( Fig. 4 ); male terminalia as Figs. 25–27 , female terminalia as Fig. 28 , with second segment of cerci broadly rounded and not tapered apically; female fore tibia ~1.1 times as long as fore basitarsus; British Columbia to California ............... … D. sohnsi Fitzgerald n. sp. - Basal third of wing with macrotrichia unevenly distributed and with large bare areas (cell br+bm mostly bare) ( Fig. 1 ); male unknown; female terminalia as Figs. 8–10 , with second cercus more narrow and slightly tapered to a round point apically ( Fig. 10 ); female fore tibia ~1.5 times as long as fore basitarsus ( Fig. 7 ); Washington …............ D. elongata Fitzgerald n. sp.