Full-text - Norsk entomologisk forening

Megamerina dolium (Fabricius, 1805) (Dipt.Meganlerinidae) in NorwayLITA GREVE AND FRED MIDTGAARDGreve, L. & Midtgaard, F. 1987. Megamerina dolium (Fabricius, 1805) (Dip!. Megamerinidae)in Norway. Fauna norv. Ser. B, 34, 35-36.Megamerina dolium (Fabricius, 1805) (Dip!. Megamerinidae) is recorded from Frogn,Hli0ya in Akershus county. This is the second record from Norway, and the first innearly 140 years. One male was sorted out from Malaise-trapped material caughtbetween 3-16 June 1984.Uta Greve, Zoological Museum, University ofBergen, N-5007 Bergen Uni v., Norway.Fred Midtgaard, Norwegian Forest Research Institute, p.a. Box 61 N-1432 As-NLH,Norway.In connection with a study of the insect fauna len (pers. comm.) has informed us that M.of Ha0ya in the Oslofjord, light-traps, win­ dolium probably developes in rotten wooddow-traps and Malaise-traps have been used though it has not been proved. Specimensin the years 1983 and 1984. In material col­ have in England been caught close to decayedlected in a Malaise-trap between 3-16 June1984, one male Megamerina dolium wasfound. The trap was placed in an open decidiousforest with Tilia, Ulmus and Quercusnear old oak trees with dead branches. Theforest in this part of the island has been partlyprotected for decades, and a proportionalhigh number of dead and decaying trees canbe found in this area. The bottom vegetationwas rich. The trap was operated from April toSeptember 1984. The island HA0ya (EIS 28)is in Frogn community and Akershus county.No more specimens were found in this trap(A), and no specimens at all in another trap(B) positioned on the island during 1984.Megamerina dolium (Fabricius, 1805) isthe only representative of the family Megamerinidaein Scandinavia. Megamerinidae isa very small fly family numbering between- -­-- ~ - - - - -~15-20 species on a world basis. The family ----- - - - --­-. - - -- -is usually placed in the superfamily Psiloidea·­(Rohdendorf 1974).M. dolium is a fly of medium size, slender,8-10 mm long. Most ofthe head, thorax andabdomen is black. In dry specimens the lowerpart around the eyes are with a silvery shinewhich looks black in alcohol fixated specimens.Hind femora with two rows of short,Fig. 1. Upper: Head of Megamerina dolium (Fa­stout spines - see Fig. 1.bricius).Until recently little information was to be Lower: Hind leg - femur; note the two rows offound on the biology of M. dolium. A.A. AI- ventral spines.Fauna norv. Ser. B. 34: 35-36. Oslo 1987.35