[Ecology and morphology of the horsefly Tabanus infestus (Tabanidae)]

Unknown earlier male, larva and pupa of Tabanus infestus Bog. et Sam. are described. The male of the species differs from these of T. armenicus and T. indrae in the absence of black hairs on tentacles, in thick long light pubescence of the body, and light pubescence of tibia of the 2nd and 3d pairs of legs. T. infestus is distributed in Armenia and Nakhichevan ASSR in mountain regions at the altitude of 1400 to 1700 m. Larvae, hydrobionts-reophils, develop under stones on the bottom of mountain streams and rivers at the depth of 60 cm. The flight of tabanids lasts depending on the altitude from the first decade of July to the middle of August.