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Bibionidae, Xylophagidae, Rhagionidae, Psilidae,-Micropezidae, Clusiidae and Piophilidae (Diptera)from the Dovretjell National Park, South Norway*LITA GREVE, JOHN O. SOLEM AND SIMEN BRETTENGreve, L., Solem, J.O. & Bretten, S. 1987. Bibionidae, Xylophagidae, Rhagionidae,Psilidae, Micropezidae, Clusiidae and Piophilidae (Diptera) from the Dovrefjell NationalPark, South Norway. Fauna norv. Ser. B, 34, 75-79.Diptera belonging to the families Bibionidae, Xylophagidae, Rhagionidae, Micropezidae,and Clusiidae, together with some selected genera of Piophilidae and Psilidae,from the middle, low and sub-alpine zones ranging 1452 m to 900 m a.s.l., wereinvestigated. Species of Bibionidae, Xylophagidae, Clusiidae and Piophilidae are onlyreferred to, because they have been treated in previous papers.Three species of Rhagionidae were collected in Dovrefjell National Park: Rhagioscolopacea (L.), Symphoromyia crassicornis (Panzer) and Chrysopilus luteolus (Fallen).R. scolopacea and S. crassicornis are both common in the area, while C. luteolusoccur rarely in the sub-alpine zone. Flight periods for the common species are figured.The flight period for S. crassicornis is about the same in the Dovrefjell mountains andthe lowland of Norway. R. scolopacea flies later in the season in the mountains than inthe lowlands of Norway.Uta Greve, University of Bergen, Zoological Museum, Museplass 3, N-5007 Bergen-Univ., Norway.John O. Solem, University of Trondheim, The Museum, Erling Skakkesgt. 47A,N-7000 Trondheim, Norway.Simen Bretten, Kongsvoll Biological Station, N-7340 Oppdal, Norway.INTRODUCTIONThe present paper deals with Diptera belongingto several different families collected inthe surroundings of Kongsvoll in the Dovrefjellmountains. The two families Psilidaeand Piophilidae are represented with selectedgenera only. For the remaining five families,all material sorted out have been treated.The area sampled is entirely within theDovrefjell National Park and the adjacentprotected area. Our national parks are areaswith a high degree of protection, and theinsect fauna is ofgreat interest because scien­tific documentation of the fauna will increasethe value of the parks as reference areas.The methods used for collecting were cho­sen to give a good survey of the aquatic insects,and the traps were therefore placednear running or still water. For those Dipterawhose larvae live in other habaitats than wa­ter, wet or marshy areas, collecting at othersites would probably give more comprehensivedata on flies in the Dovrefjell NationalPark.STUDY AREA AND METHODSThe study area was the surroundings ofKongsvoll Biological Station (62 0 ITN, 09 059'E) between the elevations 900 and 1452 m(Fig. 1). Two large geological regions in thesouthern Scandinavian Caledonian meet inthe sampling area, and the border roughlyfollows the River Driva. On the eastern sideis the Trondheim region, which containsmainly medium-grade schists and greensto­nes of the cambro-silurian age. The westernside is mainly a basal gneiss region built up ofhigh-grade gneisses and schists of precam­brian age. The differences in the geologybetween the eastern and the western side ofthe valley are most conspicuous when plantspecies are considered. The eastern side has a* Printing grant given by Kongsvoll biological much higher diversity of plant species thanstation.the western one. The sampling sites Stropla,FtlJDI/l norv. SeT. B, 34: 75-79. Oslo 1987. 75