Dolichopus humilis Van Duzee

Negrobov, Oleg P. & Grichanov, Igor Ya., 2013, On the distribution of Dolichopus humilis Van Duzee in the Palaearctic Region and a new synonym (Diptera: Dolichopodidae: Dolichopus latipennis species group), Zootaxa 3599 (5), pp. 499-500 : 499

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.