S. Mahunka szerk.: Folia Entomologica Hungarica 54. (Budapest, 1993)

Fannia canicularis — 6 1 1 8 Fannia melania 4 4 Fannia difficilis 1 1 1 1 49 53 Fannia sp. 1. 1 1 Fannia sp. 2. 1 1 Mydaea orthonevra 1 1 Mydaea affinis 4 4 Mydaea electa 6 1 1 3 11 Mydaea humeralis 36 20 9 3 24 132 224 Thricops diaphanus 3 5 4 2 14 Phaonia pallida 1 1 Phaonia rufiventris 1 3 3 4 11 Phaonia subventa — 2 2 Muscina levida 23 2 4 18 2 23 72 Muscina stabulans 2 1 1 1 5 Conclusions Association of Diptera with fungi There must be a strong relation between the fungi and Diptera developing inside them. Their coexistence can hardly be explained by chance (Dely-Draskovits and Babos 1976/a). Specialization aspects Some of the fungicolous Diptera occur only in certain groups of fungi -regardless the time and location of the collection-, or they prefer these fungi groups to others. This preference might be an indication of the special requirements of the Diptera towards its host: the fungi (Dely-Draskovits and Babos 1976/a). Phenological aspects Even the eurytopic Diptera exhibit preferences towards certain fungi, but these preferences are not related to the characteristics of the fruiting body. The preference shown by a lot of Diptera -developing in fungi- towards certain fungi is only illusive, and they in fact live with the fungus only in an advantageous period (or periods) of the growing season. This phenological association is characteristic for the fungicolous species of certain Diptera families. On this basis we can differentiate three groups of fungicolous Diptera: species occurring during the summer part, autumn part or during the whole growing season. The Diptera and their fungi hosts form special associations, which are characterized by the co-occurrence of the host and its parasitic Diptera. The shift between the summer and autumn group takes place in September, and hence the number of species and their abundance is the highest in this month (Dely-Draskovits and Babos 1976/a). Geographical aspects In May and June both the fungi, and the Diptera developing in them occur in high numbers in the areas of the Great Plain. In the mountain regions and at the western border of Hungary