S. Mahunka szerk.: Folia Entomologica Hungarica 61. (Budapest, 2000)

i.e. 9-10 litres of material was collected and transferred into the laboratory in three vessels, 10 litres each. Altogether 6930 specimens of 15 species were reared. The vessels were amplified by a photoeclector-type head but dead adults were also collected by an aspirator when cover was removed while watering the material. Diptera species Vespa nests No. 1 No. 2 Tinearia alternata 0 1 Cecidomyiidae sp. 1 12 3 Cecidomyiidae sp. 2 56 0 Lycoriella cellaris 429 6017 Sciaridae sp. 3 5 Coboldia fuscipes 25 200 Drapetis assimilis 10 1 Megaselia sp. 1-3 143 sp.1-2 2+9 Eccoptomera obscura 0 75 Tephrochlamys tarsalis 7 119 Gymnochiromyia inermis 0 1 Telomerina flavipes 1 0 Phyllomyza longipalpis 6 187 Desmometopa sordida 44 219 Fannia aequilineata 4 0 Fannia scalaris 99 28 Potamia littoralis 456 63 Total of 19 species 1295 6930 Nests are well-known breeding media for several groups of dipterous flies, including wasps nests, or somewhat more widely, nests of the social Hymenoptera. The literature is rather rich also on them (see e.g. in Ferrar (1987)), so below only a limited number of works is mentioned. Ferrar (1987) summarizing data on life habits of flies tabulated "Commensal associations of larvae of Cyclorrhapha", where the following families are shown as breeding in nests of wasps (families, whose representatives were found also in this study are italicized): Anthomyiidae, Chloropidae, Fanniidae, Heleomyzidae, Muscidae, Phoridae, Sarcophagidae, Sphaeroceridae, Syrphidae. In his Text-figure 8 (analysis of breeding media of Diptera Cyclorrhapha) "Nests" are originated from "Detritus" (and the latter one from the "Original medium" of rotting vegetable matter). Indeed, most of the species reared now are expected to develop in detritus materials of the nests. In 1997 adults emerged were taken from the vessel in every second day, later once or twice a week. This way we can give some impression on the dynamics of emergence of the dominant-subdominant species. There were only the Megaselia species, which emerged within two weeks in the laboratory. The second phase is from ca. 16th—20th day