Pegomya tenera Zetterstedt 1838

6. Pegomya tenera (Zetterstedt, 1838)

(Figs 29, 38, 47, 56)

Anthomyza tenera Zetterstedt, 1838: 697.

Pegomya tenera (Zetterstedt). Michelsen 1985: 57, figs 1‒6. Ståhls et al. 1989: 105.

Description. Very similar to P. zonata but different as follows: Size. Smaller, wing length 5.0‒5.4 mm (n=6). Male. Palp more extensively darkened on distal half. Yellow mid and hind femora more conspicuously darkened on apical quarter to apical third. Terminalia (Figs 29, 38, 47, 56): Sternite V with downward projecting inner lamella smaller; surstyli less angular and apically slenderer in profile view; postgonite with anterior expansion lying immediately distal to insertion of enlarged seta, not on distal quarter as seen in P. zonata; epiphallus without peculiar basal expansion seen in P. zonata. Female. Scape and pedicel fuscous ochre brown. Palp yellow basally, dark on distal half. All femora dorsally on distal fifth with a distinct dark mark. Oviscapt shorter and with bigger sternite VIII pieces, in good agreement with description given for P. scapularis.

Material examined. [FMNH, MZLU, ZMUC]. FINLAND: Tavastia australis: Lammi, 2♂ ex Leccinum scabrum leg. 1983 (E. Ribeiro). SWEDEN: Jämtland: Slagsån nr Undersåker, Malaise trap, 10♂ 24‒26.vii.1980 (A. C. Pont); Hensjö, 1♀ 22.vii.1980 (A. C. Pont). Åsele Lappmark: Nästansjö, 1♂ (lectotype) 13.vii.1832 (J.W. Zetterstedt). Lule Lappmark: Leipojoki nr Gällivare, 1♂ 16.vii.1974 (S.-O. Ulefors). Torne Lappmark: Abisko, 1.5 km W of NVS, Ridonjira mouth, 360m, 2♂ 29.vii.2001 (D.M. Ackland). Abisko, 1.5 km S of NVS, L. Pajep Njakajadre, 460m, 1♂ 2.viii.2001 (D.M. Ackland). Abisko, 1.75 km W of NVS, E Bank of Abiskojåkka, 360m, 1♀ 30.vii.2001 (D.M. Ackland).

Distribution. Known so far only from a few boreal to subarctic sites in Norway: Inner Finnmark (W. Adaschiewitz, in litt.), Finland and Sweden.

Biology. In southern Finland (Ståhls et al. 1989) reared from larvae developing in sporocarps of Leccinum (Boletaceae).