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Contributions to the knowledge of the insects fauna on the Bansko Hill area: Horse flies (Diptera: Tabanidae) and Dragonflies (Odonata)

The studies of horse flies and dragonflies of the Bansko Hill surroundings were carried out from April to September 2010. The following methods were used: collecting by canopy traps with attractants or entomological nets, the method of strolling and observing. Mapping and digital analyses of the data were done using ArcView 9.2 program. On the basis of the 362 collected specimens of horse flies and literature data a total of 19 species of 6 genera and 2 subfamilies were recorded. On the basis of the 618 collected individuals at different stages of life (larvae - exuvia and adult individuals), a total of 27 species, 22 genera, 8 families and 2 suborders of the order Odonata were recorded. Out of these numbers, 5 species of horse flies: Chrysops viduatus (Fabricius, 1794), Atylotus loewianus (Villeneuve, 1920), Tabanus bovinus Linnaeus, 1758, Hybomitra solstitialis (Meigen, 1820) and Heptatoma pellucens (Fabricius, 1776) and 5 species of dragonflies: Coenagrion ornatum (Selys, 1850), Hemianax ephippiger (Burmeister, 1839), Libellula fulva (Müller, 1764), Orthetrum coerulescens (Fabricius, 1798) and Sympetrum flaveolum, Linnaeus, 1758 are new for the Bansko Hill. The horse fly species with the highest abundance were Tabanus tergestinus Egger, 1859 (36.74 %), T. bromius Linnaeus, 1758 (25.70 %) and T. maculicornis Zetterstedt, 1842 (13.81 %). The dragonfly species with highest abundance based on frequency of encounter were: Aeshna mixta Latreille 1805, Coenagrion puella (Linnaeus, 1758), Ischnura elegans (Vander Linden, 1820), Orthetrum albistylum (Selys, 1848), Sympetrum striolatum (Charpentier, 1840). Sympecma fusca (Vander Linden, 1820), Sympetrum depressiusculum (Selys, 1841) and Sympetrum fonscolombei (Selys, 1840) had lowest abundance. The established qualitative structure of these two insects groups in the study area represents 24.35 % of horse flies, and 36.98 % of dragonfly national fauna, respectively. Our research proves that the study area is significant for the protection of the biodiversity of the insect fauna.

Horse flies; Tabanidae; Dragonflies; Odonata

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