In the West-Palaearctic region, Bombus alagesianus is restricted to Anatolia, Transcaucasia, Caucasus and N. Iran. As it lives in remote places of high mountains, rather few specimens have ever been collected.
Outside the West-Palaearctic region, B. alagesianus is found in the mountains of Mongolia (ssp. mongolicus) and in the Alai and the Pamir (ssp. pamirus). As the distribution centre of the species lies in central Asia, it may also be expected to be present in the Altai and Sayan Mts.
P. Rasmont