Bombus variabilis is a critically endangered species of cuckoo bumblebee that occurs in North America.

It has not been observed in the United States in at least 20 years and is potentially extirpated or extinct.

Females kill and replace the queens of B. pensylvanicus, taking over their nests in the process.

[3] This species of bee can be distinguished by the lack of pollen baskets.

For females, they only have black abdomens but males can vary in their hair color patterns.