Species that are associated with nests of true bumblebees (Bombus spp.), especially underground nests. Includes the cuckoo bumblebees that are inquilines in the nests of true bumblebees, plus species that are parasitoids or scavengers in the nest.
Includes the cuckoo bumblebees that are inquilines in the nests of true bumblebees, plus species that are parasitoids or scavengers in the nest.