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ut from a zoogeographical point of view, afew should be commented on. I. difformiswas captured at two sites, lerosbekken andKvernbekken, and are the westernmost recordsin the mountains of South Norway. N.avicularis was recorded only at lerosbekken.N0st (1981) also reports N. avicularis fromone site only, the lake Lindalsvatn. These twomentioned records are, according to Lillehammer(1974), the westernmost records inthe mountains of South Norway.Lillehammer (1974) recorded 27 stoneflyspecies in the eastern part and 22 species inthe western part of the mountain range ofSouth Norway. The present study, which isinbetween the areas reported by Lillehammer(1974), revealed 24 species to inhabit thewatercourses of the Dovrefjell NationalPark. Compared with the eastern area (Lillehammer1974), we have not recorded Leuctradigitata, but L. digitata is reported fromthe stream Gr0vu west of the Dovrefjellmountains (N0st 1981); nor did we find Nemouraflexuosa Aubert and Isoperla nubeculaNewman. The two last mentioned specieswere neither reported by N0st (1981)from the western part of the mountains ofSouth Norway.Lillehammer (1974, 1978) reported fourspecies, C. atra, A. standfussi, I. obscura andA. compacta to occur in streams in the middlealpine zone in the 0vre Heimdalen area, 10­tunheimen, and only C. atra and A. compactaare in common with the collections'from theDovrefjell mountains. B. risi, A. sulcicollisand L. hippopus were taken with one or twoindividuals only in the trap in the middlealpine zone, and are most likely blown infrom lower areas.From the 0vre Heimdalen area in 10tunheimen,Lillehammer (1978) reported 11 and20 species from the low alpine and sub-alpinezones, respectively, and respectively 16 and25 for the whole southern Norway (Lillehammer1985). In the Dovrefjell mountainsthe corresponding numbers are 14 and 23species. From a botanical point of view theDovrefjell area is very rich in species, and asimilar pattern may be true also for stoneflieswhen compared with other mountains areasat similar elevations.ACKNOWLEDGEMENTSSupport to the field work of this paper hasbeen given by The Norwegian ResearchCouncil for Science and the Humanities,grant nos D.65.73-1O and D.65.73-032, givento 1.0. Solem.REFERENCESLillehammer, A. 1974. Norwegian stoneflies. n.Distribution and relationship to the environment.Norsk ent. Tidsskr. 21, 195,-250.Lillehammer, A. 1984. Distribution, seasonalabundance and emergence of stoneflies (Plecoptera)in the O«vre Heimdal area of theNorwegian Jotunheimen Mountains. Faunanorv. Ser. B, 31, 1-7.Lillehammer, A. 1985. Zoogeographical studieson Fennoscandian stoneflies (Plecoptera). J.Biogeogr. 12, 209-221.Nordhagen, R. 1943. Sikilsdalen og Norges fjellbeiter.Bergen Mus. Skr. 22, 1-607.Nost, T. 1981. Ferskvannsbiologi~keog hydrografiskeunders0kelser i Driva-vassdraget 1979­80. K. norske Vidensk. Se/sk. Mus. RapportZoo/. Ser. 1981-10, 1-77.Ronning, 0.1. 1972. Vegetasjons/rere. Universitetsforlaget,Oslo.Sjors, H. 1967. Amphi-Atlantic zonation. Nemoralto Arctic. Pp. 109-125 in Love, A. & Love,D. (Eds.). North At/antic 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, 32,62-79.50