Euura fasciata

257 Euura fasciata (Konow, 1897) Figs 264, 474 Amauronematus fasciatus Konow, 1897: 177–178. Lectotype designated by Muche (1975). Amauronematus perkinsi Benson, 1933: 256–257. Synonymy by Benson (1958a). Diagnosis Pale pterostigma, ventrally extensively pale body, and centrally black abdominal terga with pale anterior and posterior margins usually distinguishes the females from the others in the group. Females of Euura variator can be similarly coloured, but E. variator is found in (sub)arctic habitats, unlike E. fasciata. Males of E. fasciata are also the palest in the group and because of high similarity in penis valves are most easily confused with E. vittata found in the same habitats. The males of the two species may be separated as follows, at least usually: – distance between inner margins of lateral ocelli about as long as length of postocellar area, abdominal terga laterally extensively pale, dorsally some posterior margins pale, dorsal margin of hind tibia (almost) completely black .................................................................................................. E. fasciata – distance between inner margins of lateral ocelli larger than length of postocellar area, abdominal terga completely black or slightly pale laterally, dorsal margin of hind tibia usually black only at apex ....................................................................................................................................... E. vittata Type material examined Lectotype Amauronematus fasciatus GERMANY – Mecklenburg-Vorpommern • ♀; Teschendorf in Mecklenburg; 53.45° N, 13.36° E; 6 May 1896; F.W. Konow leg.; SDEI, GBIF-GISHym4092. Holotype Amauronematus perkinsi UNITED KINGDOM – England • ♀; Buckinghamshire, Halton, Dancer’s End; 51.770° N, 0.690° W; 29 May 1930; R.B. Benson leg.; BMNH, B.M.TYPEHYM.1.641. Host plants Only reliably recorded from Salix caprea (e.g., Benander 1966; Vikberg & Kontuniemi 1971). Genetics COI Based on 9 specimens, maximum within-species distance is 4.71% and the nearest neighbours, diverging by a minimum of 0%, are Euura semilactea and E. variator. Nuclear Based on 7 specimens, maximum within-species distance is 0.85% (0.38% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.4%, is Euura variator. Distribution and material examined Palaearctic. Specimens studied are from Bulgaria, Finland, France, Germany, Russia, Sweden, and the United Kingdom.