On the distribution of Dolichopus humilis Van Duzee in the Palaearctic Region and a new synonym (Diptera: Dolichopodidae: Dolichopus latipennis species group) Author Negrobov, Oleg P. Author Grichanov, Igor Ya. text Zootaxa 2013 3599 5 499 500 journal article 10.11646/zootaxa.3599.5.8 788c0c7e-0bf3-47b9-ade3-940776dd7533 1175-5326 220518 64D9D6F7-E5B5-41A5-8EA8-DC2F8962D261 Dolichopus humilis Van Duzee Dolichopus humilis Van Duzee, 1921 : 108 ; Pollet & Böcher, 2005 : 10 . Dolichopus lantsovi Negrobov, Grichanov et Barkalov, 2009: 41 . syn. nov. Material examined. Denmark : 23 3 and 23 Ƥ [ Denmark :], Thule [northwest side of the island of Greenland ], VII.1940 , 1951, 1952, Chr. Vibe ( ZMUC ). Russia : 1 3, Yakutia, Saskylakh airport, forest-tundra, lake shore, 24.VII.1988 , Gorodkov ( ZIN ); 1 Ƥ, Yakutia, Tiksi, tundra, small marsh, 2.VIII.1957 , Gorodkov ( ZIN ); 7 3, 3 Ƥ, Chukotka, N Egvekinot along road, small marsh, 29.VII.1963 , Gorodkov ( ZIN ); 2 3, 3 Ƥ, Chukotka, Apapelkhin, 15 km NEE Pevek, tundra, sedge at small lake, 15.VII.1963 , Gorodkov ( ZIN ). Diagnosis. Dolichopus humilis has an elongated antennal scape and a shortened wing bearing a strong costal callus in males and therefore is referable to the Dolichopus latipennis species group, which presently comprises 13 species ( Negrobov et al . 2009 ; Selivanova & Negrobov 2011 ). Dolichopus humilis is most similar to D. acutangulus Negrobov et Barkalov, 1976 , which is known from Mongolia and Russian Transbaikalia, but differs from D. humilis in the following features: cilia of lower calypter black and postpedicel apically pointed. Female D. humilis keys to arctoboreal D. costalis Frey, 1915 ( Negrobov et al . 2009 ) , which differs from D. humilis in entirely black femora and black cilia on lower calypter. Variability of Dolichopus humilis . Fore femur black-brown except distal third or knee; mid femur brownish-yellow or dirty-yellow, somewhat darker at base; hind femur dirty-yellow, darkened on basal third or entirely pale brown. Mid femur with 1 strong anterior preapical bristle ( Negrobov et al . 2009 erroneously mentioned 2 bristles); hind femur with 1–4 (usually 2–3) anterior preapical bristles. Hind tibia more or less conspicuously thickened at basal third and at apex, with 4– 5 anterodorsal, 5–6 dorsal to posterodorsal bristles.