Two-winged insects (Insecta: Diptera) of Pirin

Abstract

A total of 742 two-winged species that belong to 43 families have been reported from Pirin Mt. The larger number of species (394 species, or 53.2%) has been found in the beech forest belt. The established species belong to 72 areographical categories. The dipterous fauna can be divided into 2 main groups: 1) species with Mediterranean type of distribution (48 species, or 6.4%) - more thermophilic and distributed mainly in the southern parts of the Palaearctic. Five species of southern type, distributed in the Palaearctic and beyond it, can be formally related to this group as well; 2) species with Palaearctic and Eurosiberian type of distribution (694 species, or 93.6%) - more cold-resistant and widely distributed in the Palaearctic. 155 species of northern type, distributed in the Palaearctic and beyond it, can be formally related to this group as well. The zoogeographical character of the Tachinidae fauna is determined by the second group. The ration of the two groups is different in the separate vegetation belts of Pirin Mt.

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