Faro. PsilidaeMaterial of Psilidae was not sorted out of theMalaise trap samples. However, a recentcheck ofthis family in the collections of ZooI.Mus., Univ. Bergen, revealed one speciesprobably new to the fauna of Norway. Thisrecord was from the Dovrefjell NationalPark: STI Oppdal, Kongsvoll, I ~ , 890 ma.s.l., 8 July 1966, Psila (Psi/a) merdariaCollin, 1944. Some of the specimens in Bergenhad been determined as the closely relatedP. fimetaria (L., 1761). P. fimetaria wasoutnumbered by P. merdaria in the collectionchecked (2: 12), and this could indicate thatP. merdaria is the more common species. Lyneborg(1963) reports this trend in the Danishmaterial. The distribution ofP. merdaria(based on material in Bergen only) is: VE,HOY, HOI, SFI and TRY, viz. all over thecountry.Faro. MicropezidaeOne species, Calobata petronel/a (L., 1758),was collected from Blesbekken, 1000 m a.s.l.,and Raubekken, 900 m a.s.l. One female onlyfrom each locality. Material of C. petronel/ain Norwegian collections has been checkedand only one locality at Haugastol, Buskerudprovince, represents a sub-alpine habitat at990 m a.s.l. C. petronel/a is a common flyspecies in the lowlands all over Norway.Faro. ClusiidaeOne species, Clusiodes apicalis (Zetterstedt,1841), was recorded from Blesbekken (8inds). The family Clusiidae was treated byGreve & Midtgaard (1986), and the materialfrom Blesbekken included. C. apicalis isfound widely scattered in Norway.Faro. PiophilidaeOne species, Piophila (Amphipogon) flava(Zetterstedt, 1838), was sorted out from thematerial where it occurred in surprisingnumbers at some localities, see also Greve &Solem (1983). P.flava has been found scatteredin Norway. For more details, see Greve &Solem (1983).DISCUSSIONThe present investigation and earlier surveysin mountainous areas in Norway (Greve1980), show that the Rhagionidae, representedwith three sp~cies, is well established inalpine habitats. Sweep-netting is a good methodfor collecting these flies, and a highernumber of specimens were collected in theIBP survey at Hardangervidda, where suchnets were much used. C. luteolus was notcollected in Malaise traps, but solely bysweep-netting. Judged from material inNorwegian collections, C. luteolus will probablynot be found above the sub-alpinezone.R. scolopacea and S. crassicornis seem tohave stable populations in alpine habitats. S.crassicornis is common in the Kongsvollarea, as it was at Hardangervidda also (Greve1980). The species is fairly rare in the lowlands.This trend was first noted in Scandinavianmaterial by Ringdahl (1951). Theflight period ofR. scolopacea commence andterminates later in the season in the Kongsvollarea than in the lowlands. Such differencesbetween mountain and lowland populationsare commonly found in insects. This isnot found for S. crassicornis, where the flightperiod in the lowlands is approximately thesame as in the Kongsvoll area.The rhagionid genus Ptiolina was notfound in the material. Some Ptiolina speciesconfined to alpine habitats are rare, but havebeen recorded from a few areas in Norway.One record is from northern Oppland province,Dovre community, Svana, at about1200 m a.s.l., viz. an area bordering to theDovrefjell National Park. It is reason to believethat Ptiolina is also present in the DovrefjellNational Park, but that this genus preferother habitats than sampled in this survey.The genus is at present under revision, and itis still uncertain which species are representedin the Norwegian fauna outside the lowlandspecies P. obscura (Fallen, 1814).The Micropezidae and Psilidae are bothrepresented with a small material, which giveno basis for discussion. The families Bibionidae,Xylophagidae, Clusiidae and Piophilidaehave been treated extensively in earlierpublications referred to above.78
ACKNOWLEDGEMENTSSupports to the field work of this paper hasbeen given by The Norwegian Research Councilfor Science and the Humanities, grantnos D.6S.73-10 and D.6S.73-032, given toJ.O. Solem.REFERENCESGreve, L. 1980. Rhagionidae (Diptera). Fauna ofHardangervidda 15, 1-6. Univ. Bergen, Oslo,Tromso Pub!.Greve, L. 1984. Snappefluer (Rhagionidae) iNorge. Fauna, Oslo 37,6-10.Greve, L. 1987. Bibio nigriventris Haliday, 1833(Dipt. Bibionidae) in Norway. Fauna norv.Ser. B, 34, 19-22.Greve, L. & Midtgaard, F. 1986. The Clusiidae(Diptera) from the islands Haoya and Ostoyain the Oslofjord and a survey of th:: family inNorway. Fauna norv. Ser. B, 33, 86-92.Greve, L. & Solem, J.O. 1983. Piophila (Amphipogon)flava (Zett., 1838) in Norway (Dipt.,Piophilidae). Fauna norv. Ser. B, 30, 81-83.Greve, L., Solem, J.O. & Olsen, A. 1984a. Distributionand flight period of Bibionidae(Dipt.) in Dovrefjell mountains near Kongsvoll,Central Norway. Fauna norv. Ser. B, 31,88-91.Greve, L., Olsen, A. & Solem, J.O. 1984b. Xylophaguscompeditus Wiedemann, 1851 in Norway(Dipt., Xylophagidae). Fauna norv. Ser.B, 31, 111-113.Lyneborg, L. 1963. Danish Acalypterate Flies. 2.Psilidae, Platystomidae and Otitidae (Diptera).Ent. Meddr. 32, 367-388.Nordhagen, R. 1943. Sikilsdalen og Norges fjellbeiter.Bergen Mus. Skr. 22, 1-607.Ringdahl, O. 1951. Flugor fran Lapplands, Jiimtlandsoch Hiirjedalens fjiilltrakter (DipteraBrachycera). Opusc. ent. 16, 113-116.Ronning, 0.1. 1972. Vegetasjonsltere. Universitetsforlaget,Oslo.Sjors, H. 1967. Amphi-Atlantic zonation. Nemoratto Arctic. Pp. 109-125 in Love, A. & Love,D. (Eds) North Atlantic biota and their history.Pergamon Press, Oxford.Solem, J.O. 1985. Distribution and biology ofcaddisflies (Trichoptera) in Dovrefjell mountains,Central Norway. Fauna norv. Ser. B, 32,62-79.79
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No. 11987SER. B VOL. 34NO. 1Norwegi
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Professor Ole A. Srether 50 yearsFo
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senting and systemising these chara
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Raddum, G. & O. A. Sa:ther 1981. Ch
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Contribution to the knowledge of th
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dia is the type locality, Livonia,
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Sverre Kobro, Carl Fredrik Liihr, R
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-.Occurrence and life cycle of Dino
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width of 1 2 3 4pronotum n: 19 13 I
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LITTERAT.UREAubert, J. 1946. Les Pl
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Fig. 1. Brachycaudus (Acaudus) popu
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Nymphal development and food consum
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espectively. At 20°C, mean number
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