Bombus flavifrons


Bombus flavifrons, the yellow-fronted bumble bee or yellowhead bumblebee, is a species of bumblebee. It is native to North America, where it is distributed across much of Canada, Alaska, and the western contiguous United States.

Description

This is a robust bumblebee; the queen has a body length between and a wingspan of, the male is in length with a wingspan of, and the workers are in length and in wingspan.
The yellow-fronted bumble bee has a dense, untidy fur. The head is yellow with black hairs intermixed on the posterior part, the thorax has a mixed black and yellow colouration, often with a black, central field. The first two terga are yellow, on the females often with a black, central field on terga 1 to 2. Terga 3 and 4 are red, and the tail black, sometimes with yellow fields.
;Subspecies
Subspecies include:
  • B. f. dimidiatus — with the red fur more or less entirely replaced with black
  • ''B. f. flavifrons''

    Ecology

The queen emerges from her hibernation at the end of March and often builds a nest in a disused mouse nest. The first workers appear about a month later. The nest declines at the end of August, and all the inhabitants die, except for the new queens, which hibernate in the earth. The bumblebee feeds on several flowering plants, most commonly those in Asteraceae, Fabaceae, Saxifragaceae, and Lamiaceae.
This species is host to the parasitic indiscriminate cuckoo bumblebee.
This bee occurs at high altitude and latitude, living in habitat such as tundra, taiga, and mountain forests and meadows.