Cuckoo-bee-host
Guides
Bombus appositus
White-shouldered Bumble Bee
Bombus appositus, the white-shouldered bumblebee, is a western North American bumble bee species found in open habitats from southwestern Canada through the Cascade Mountains and Sierra Nevada to central California. It nests underground or on the surface and has been documented feeding on diverse floral resources including giant hyssops, thistles, gentians, and clovers. The species is known to be a host for the cuckoo bumblebee Bombus insularis.