Pegomya furva Ringdahl 1938

3. Pegomya furva Ringdahl, 1938

(Figs 5, 13, 14, 20‒23)

Pegomyia (Pegomyia) furva Ringdahl, 1938: 212, figs 43, 44 (on p. 210), fig. 16 (on p. 211).

Pegomya furva Ringdahl; Hennig 1973b: 560, text figs 485, 486, table figs 778, 884, 985; Hackman 1976: 132; Hackman 1979: 63; Hackman & Meinander 1979: 74; Ackland 1989: 228, figs 40‒45.

Pegomya (Phoraea) furva Ringdahl; Griffiths, 1983: 224, figs 315, 317, 319‒322. For further references, see Hennig (1973b) and Griffiths (1983)

Description. Size. Small, wing length up to 5.3mm. Male. Head, body and appendages extensively brownish black except for dark ochre yellow tibiae and palpal base; thorax and abdomen covered in dense brownish grey dusting demarcating a narrow median dark stripe on tergites II‒V. Contiguous parafrontalia narrow, throughout separating eyes by less than 0.5x width of anterior ocellus. Proepimerals: 1 seta and 1‒2 setulae. Lower calypter smaller than upper calypter and concealed behind it in lateral view. Hind femur on basal third only with decumbent setulae on pv surface. Terminalia similar to those of P. circumpolaris, but different as follows: Left side of pregenital sclerite without a glossy area. Sternite V (Figs 13, 14) smaller and with shorter lateral setae on posterior lobes; hypopygium (Figs 20, 21) with shape of surstylus different, especially in lateral view; gonites and phallus (Figs 22, 23), especially pregonite, also showing some differences. Female. Antenna wholly brownish black. Palp brownish black with ochre yellowish basal third. Frontal vitta wholly dark or narrowly orange yellow above lunule. Thorax wholly dark or slightly translucent yellowish on postpronotal callus and distal part of scutellum. Legs mainly ochre yellow with brownish black tarsi; fore femur sometimes brownish infuscated. Abdomen ochre yellow to darkly reddish brown, shining through thin greyish dusting. Proepimerals: 1 seta, 1‒2 setulae. Lower calypter smaller than and barely visible behind upper calypter in lateral view. Oviscapt very short, indiscernible from that of P. circumpolaris (Figs 66, 67).

Material examined. [FMNH, MZLU, ZMUB, ZMUC, ZMUT]. Type material. Ringdahl (1938: 212) described Pegomyia (Pegomyia) furva from an unspecified number of males from Sweden: Torne Lappmark: Abisko and Pålno (subalpine), and Vassijaure (alpine); Jämtland: Vallbo and Åre (boreal forest). The syntype series consists of 15 males from: Abisko (3), Pålno (1) Vassijaure (1), Vallbo (9) and Åre (2), all collected by O. Ringdahl in July between 1918 and 1935. In order to fix the identity of the name furva I have labelled and designate herewith a male labelled “Vallbo / 9.7 -35” as lectotype. The remaining syntypes should be regarded as paralectotypes. They are all conspecific with the lectotype except for the male from Vassijaure that belongs to P. circumpolaris. The type series is in MZLU except for 3 paralectotypes in ZMUC. Other material. CZECH REPUBLIC: Šumava, Popelná, 49°06’N 13°38’E, 880m, meadow nr. brook, 1♂ 3.vii.1988 (M. Barták). DENMARK: Bornholm: Paradisbakkerne, 1♀ 25.vi.1965 (Martin & Vest Pedersen). FINLAND: Karelia australis: Vehkalahti, 1♂ 25.v.1975, 1♂ 1.vi.1977 (L. Tiensuu). Tavastia australis: Nurmijärvi, 1♀ 24.vii.1982 (O. Martin). Lapponia enontekiensis: Kilpisjärvi, 1♂ (W. Hellén). ICELAND: Austurland: Núpsstaðarskógar, 1♀ 4.vii.1981 (E. Ólafsson); Skaftafell, 1♀ 19.vii.1962 (Lund Univ. Exp.). NORWAY: Hedmark: Kvikneskogen, 3♀, 18‒27.vii.1977 (V. Michelsen). Oppland: Fokstumyrin, 970m, 1♀ 22.vii.1983 (V. Michelsen). Sør-Trøndelag: Kongsvoll, 900‒1100m, 2♂, 1♀ 20‒28.vii.1983 (V. Michelsen). Troms: Gratangen, Betula -forest, 1♂ 29.vi.1956 (H. Andersson). Finnmark: Bojobaeske, 1♂ 16.vii.1924 (T. Soot-Ryen). RUSSIA: Karelia: Sortavala, 1♂ (L. Tiensuu). SWEDEN: Skåne: Åbrolla, 2♀ 1‒7.vii.2004, 1♀ 1‒4 vii.2005, 1 ♂ 3.vii. 2006 (V. Michelsen). Småland: Eriksmåla, 1♀ 21.vii‒2.viii.1985 (V. Michelsen). Södra Åreda, 1♂ 5.vii.1989 (R. Danielsson). Värmland: Glaskogen, 1 ♀ 26.vi.1978 (V. Michelsen). Jämtland: Åre, 1♂ 9.vii.1948 (H.C. Huckett). Norrbotten: Lule Lappmark: Kamajokk 9km NNV Kvikkjokk, 1♀ 7.vii.1959 (Brinck et al.). Torne Lappmark: Abisko, 1♂ (Forslund), 1♂, 1♀ 6 & 11.vii.1922 (O. Ringdahl), 1♂ 11.vii.1932 (H.C. Huckett), 2♂ 13.vii.1983 (H. Andersson).

Distribution. PALEARCTIC. Germany (Hennig 1973c); Czech Republic; Britain: Scotland (Ackland 1989); Iceland; Denmark; Norway; Sweden; Finland; Russia: Karelia. NEARCTIC. USA: Alaska; Maine (Griffiths 1983); Canada: British Columbia, Ontario, Quebec, Yukon (Griffiths 1983).

Biology. In southern Finland (Hackman 1976, Hackman & Meinander 1979, Ståhls et al. 1989) reared from larvae in sporocarps of the Leccinum versipelle and L. scabrum species groups (Boletaceae). These authors did not, however, distinguish between the species P. f u r v a and P. circumpolaris that may occur together in most parts of Finland and probably exploit the same species of bolete fungi. Griffiths (1983) mentions that it was bred from Leccinum sp. found in the Yukon. Bruns (1984) reared it from Leccinum sp. aurantiacum group in Minnesota.