SeasonalityQueens fly from late March to late September, workers from late May to early October, and males from late May to late October (Thorp et al., 1983).
IdentificationBombus huntii belongs to the subgenus Pyrobombus, which is characterized by antennal flagella 2.5 to 3 times longer than the scape, and by the malar space, the area from the bottom of the compound eye to the base of the mandible, which is less than twice as long as it is wide (Thorp et al., 1983). Males are distinguished by penis valves that are apically recurved inwards or are hook-shaped. The body of B. huntii is covered in dense, medium length pile (Franklin, 1912). In males, the face, occiput, and cheeks are covered in yellow pile, whereas females have black cheeks. The thorax is mainly yellow, with a black band between the wings that has a nearly straight rear margin. Segments one and four of the abdomen are yellow, two and three are ferruginous red, and the remaining two segments, five and six, are black; however, black hairs may be admixed throughout the abdomen. The wings of the queen are strongly brown, while workers and males wings are lighter coloured and are typically subhyaline. Body length and wingspan differs between castes: queens are 14 to 19 mm in length with a wingspan of 36 to 37 mm, workers range in length from 9 to 13 mm with a wingspan of 20 to 28 mm, and male body length is from 11 to 12 mm with a wingspan from 25 to 27 mm.