Bombus brodmanicus is rather poorly known. This is mainly due to its quite singular distribution : two areas separated by more than 2500 km! The nominal subspecies lives in the western Caucasus, Armenia and NE. Anatolia. The subspecies B. brodmanicus delmasi (Tkalcu) is found in the south of the French Alps and in a few nearby Italian locations. Besides, their altitudinal range is restricted and even where they are present, they stay uncommon. In their western range, they feed on a very restricted array of plants and are active very early in the morning and at sunset. Furthermore, they are the smallest of West-Palaearctic bumblebees.
P. Rasmont