Another common species in Wisconsin. Like B. impatiens, B. bimaculatus populations are also stable. Queens of this species are the first to emerge in the Spring, and can be found foraging on woodland ephemerals like Dutchman’s Breeches.
Body hair long and uneven. Thorax mostly yellow, with a circular patch of all black hairs between the base of the wings. First abdominal segment fully yellow, with a “W” or two-spotted yellow patch of hair in the middle of the second abdominal segment. While generally similar to workers and queens, males have variable and sometimes non-symmetrical coloration patterns. Males typically with some yellow hairs on the front of the face. Males also lack corbiculae, or the flattened midleg of the hind leg used for transporting pollen.