Bombus confusus is a medium sized black bumblebee, with the last segment in matte red. Very short, downy hair. In males, the hair is even shorter and matched.
Queens length: 17-19 mm.
Length of workers and males 13 to 16 mm.
Head, torax, T1, T2 and T3 are black.The rest of the gaster is matte red.