Українська ентомофауністика 2015, 6(1) : 47–49 Дата публікації: 15.05.2015 Ukrainska Entomofaunistyka 2015 6(1) ISSN 2078–9653 Homalocephala includes seven species occuring in the nemoral zones of the Holarctics (North of Europe and North America, Siberia and Far East of Asia, Alps and Caucasus). Larvae live under the bark of fallen coniferous (larches, pines, pseudotsugas) and especially deciduous (aspens, birches, poplars, willows) trees (Lukasheva, 1987; Krivosheina, Krivosheina, 1996). Andersson (1991) reviewed Fennoscandian species, including revision of Zetterstedt’s and Wahlberg’s species type material. Krivosheina & Krivosheina (1996, 1997) reviewed the species occurring in Russia, with numerous records from Siberia and Far East, described two new species from Russia, and summarized known data on the larval biology. Kameneva (2002, 2008) provided additional new records and synonymies based on studies of New and Old World type and non-type material. Key to species of the genus Homalocephala Zetterstedt 1838 (Diptera: Ulidiidae) E. P. Kameneva & V. A. Korneyev I. I. Schmalhausen Institute of Zoology, National Academy of Sciences of Ukraine, Bogdan Chmielnicki St. 15 Kyiv. 01030, Ukraine. E-mail: valery. korneyev@gmail. com E-mail: kameneva. elena@gmail. com Kameneva, E. P. & Korneyev, V. A. Key to species of the genus Homalocephala Zetterstedt 1838 (Diptera: Ulidiidae). Abstract. The genus Homalocephala is a member of the tribe Seiopterini occurring in the Holarctics. Larvae of these flies live under the bark of fallen deciduous and coniferous trees. An illustrated key to adults of seven Holarctic species is provided. Key words: Diptera, Ulidiidae, Seiopterini, Homalocephala, key. Каменєва, Е. П. і Корнєєв, В. А. Таблиця для визначення видів роду Homalocephala Zetterstedt 1838 (Diptera: Ulidiidae). Резюме. Рід Homalocephala належить до триби Seiopterini, поширеної в Голарктиці. Личинки цих мух живуть під корою листяних та хвойних дерев. Наведено ключ для визначення імаго семи видів роду, що зустрічаються в Голарктиці. Key words: Diptera, Ulidiidae, Seiopterini, Homalocephala, таблиця для визначення. Каменева, Е. П. и Корнеев, В. А. Определительная таблица видов рода Homalocephala Zetterstedt 1838 (Diptera: Ulidiidae). Резюме. Род Homalocephala принадлежит к трибе Seiopterini, распространенной в Голарктике. Личинки этих мух живут под корой лиственных и хвойных деревьев. Приведен ключ для определения имаго семи видов рода, встречающихся в Голарктике. Key words: Diptera, Ulidiidae, Seiopterini, Homalocephala, определительная таблица. The genus Homalocephala is a member of a small tribe Seiopterini (Kameneva & Korneyev 1994, 1995, 2006) distributed in the Holarctics and represented mainly by xylophylous species. Since the last published illustrated key (Andersson, 1991), numerous additional data on synonymy and distribution were published (Krivosheina, Krivosheina, 1996, 1997; Kameneva, 2001; 2008), but no comprehensive key to Homalocephala species has been published yet. Genus Homalocephala Zetterstedt 1838 Type species: Homalocephala albitarsis Zetterstedt 1838 (by monotypy). Syn. Psairoptera Wahlberg 1838. Type species: Psairoptera biumbrata Wahlberg 1838 (by subsequent designation of Andersson 1991). Key to species 1. Halters light yellow ................................................................................................................................................ 2 — Halters dark brown ................................................................................................................................................. 6 2 Vein R 1 setulose in apical portion. Face white, flattened, with poorly expressed carina in dorsal portion and poorly expressed antennal grooves. Katepisternum white microtrichose and white setulose. Wing with proximal margin of apical spot more or less perpendicular to R 2+3 vein. ........................................................................................... 3