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Tore NielsenFig. 1. Map of localities investigated. (1) Ogna, district ofOgna, (2) Rognbekken,district of Varhaug, (3) Vik, (4) Orre, (5) Kleppe, (6) Sele, (7)Skasheim, (8) Oksnevad, (9) Skjzveland, (10) Fosseikjeland (localities3-70 in district of Klepp), (11) Figgjo, (12) Brgstein, (13), Osli, (14) Helgeland,(15) Myrland, (16) Bratteber, (17) Austrgtt (localities 77 -77 indistrict of Hfiyland), (18) Sandnes, district of Sandtzes, (19) Gimra, districtof Sola, (20) Forus, district of H~yland, (21) Gausel, (22) Dale, (23) Hogstad(localities 27 -23 in district of Hetland), (24) Hillevgg, district ofStauanger, (25) Kverneviken, (26) Viste, (27) Sande (localities 25-27 indistrict of Randaberg).
HeloPhilus 429The species' choice of biotopes.The Helophilus species occur mainly in marshy and humid biotopes,such as humid bogs, the borders of lakes rich in vegetation,banks of ditches and canals etc., an observation the presentinvestigation also confirmed. Both species and individuals wereobserved in greatest numbers here.Of the species met with, H. pendulus seems to be the mosteurytope form, least tied to humid spots. It was found on all thebiotopes investigated and, although it too occursrnost abundantlyon humid biotopes, it proved to be the species most frequentlyentering drier areas. It was found in considerable numbers,among other places, in the lowest vegetation layer in dry coniferousforests. However, it seems to occur least abundantlyin dense, pure deciduous forests, probably because of theirreduced quantity of sunlight and sparse flora.The species most tied to a definite biotope are the smallspecies H. consirnilis, H. lineatus and H. lunulatus. These seemto appear almost exclusively on humid bogs and along the bordersof pools where Cornarurn palustre L. flowers abundantly.The biotopes found to have been visited by the various species,are as follows:Humid bogs, borders of lakes and pools, rich in vegetation:H. trivittatus - H. pendulus - H. hybridus - H. consirnilis -H. lineatus - H. lunulatus.Meadow, pasture: H. trivittatus - H. pendulus - H. hybridus- H. affinis - (H. lineatus).Ditches, canals, riverbanks: H. trivittatus - H. pendulus -H. hybridus.Sanddunes: H. trivittatus - H. pendulus.Coniferous forests: H. pendulus - (H. hybridus).Deciduous forests : H. pendulus .Peat moor, heather moor: H. pendulus.The species are cited systematically and not according to theirfrequency in the given biotope. Those in brackets have occurredonly occasionally in the biotope. See also under the descriptionof the individual species.Activity and behaviour pattern.Owing to its size and to the abundance of individuals in atleast two of its species, the Helophilus genus often constitutes aconsiderable part of the frequently flying and easily observedSyrphid species. In addition, the individuals are not really shy,thus lending themselves to field studies of various kinds.The Helophilus species, like other Syrphids, have a certaindaily rhythm which is particularly noticeable on warm, sunnydays.
Page 2 and 3: NORSK ENTOMOLOGISK TIDSSKRIFTRedakt
Page 4 and 5: NORSK ENTOMOLOGISK TIDSSKRIFTRedakt
Page 6 and 7: HymenopteraLDKEN. A .: A nest of Ve
Page 8 and 9: 398 Torgeir EdlandEggs for hatching
Page 10 and 11: 400 Torgeir EdlandTable I shows fem
Page 12 and 13: Torgeir EdlandNO. OFOBSERVATIONSTIM
Page 14 and 15: 404 Torgeir Edlnnd19630 1964.&000 0
Page 16 and 17: 406 Torgeir EdlandSCHBYEN, T. H. 19
Page 18 and 19: ~ber Conosoma testaceum F. und zwei
Page 20 and 21: 410 Andreas StrandSahlberg (1911) h
Page 22 and 23: Ein iiberraschendes Vorkommen vonCe
Page 24 and 25: Andreas StrandFig. 2. Nordeuropaisc
Page 26 and 27: 416 Andreas Strandhieraciifolium an
Page 28 and 29: 418 John 0. SolenzFig. 1. Records o
Page 30 and 31: Mortality of winter eggs of Metatet
Page 32 and 33: 422 Lauritz SammeResultsDaily maxim
Page 34 and 35: Nye finnesteder av NoctuoideaC F. L
Page 36 and 37: Tore Nielse.~Fig. 2. The head of th
Page 40 and 41: 430 Tore NielsenThe first hours aft
Page 42 and 43: Tore NielsenH. consimilis: June 2ls
Page 44 and 45: Tore NielsenFig. 3. Helophilus triv
Page 46 and 47: 436 Tore Nielsenfiendulus, like mos
Page 48 and 49: 438 Tore NielsenSubstrate during su
Page 50 and 51: The larval stages of the genus Bemb
Page 52 and 53: 442 Johan Andersentral side of the
Page 54 and 55: 444 Johan Andersenlong as broad (i
Page 56 and 57: 44 6 Johan AndersenB. lapponic~lnzM
Page 58 and 59: The lavval stages of BemhidionFigs.
Page 60 and 61: The larval stages of Bembidion 449F
Page 62 and 63: The larval stages of Bembidion 451F
Page 64 and 65: The larval stages of Bembidion 453s
Page 66 and 67: Koleopterologishe notiser 455f.eks.
Page 68 and 69: BokanmeldelserP a 1 m, T h u r e. 1
Page 70: informative iallfall for norske dyr

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