Bombus sonorus

Bombus sonorus, commonly known as the Sonoran bumble bee, is a species of bumble bee in the family Apidae. It is found in Central America and western and southwestern North America. Considered uncommon, it is sometimes categorized as a subspecies of Bombus pensylvanicus.

Description
The thorax of this bumblebee is predominantly yellow and it has a long tongue. It can be confused with the yellow form of Bombus crotchii and with Bombus nevadensis. It likes to collect pollen from Gossypium, Viguiera, Helianthus, Linaria, Chrysothamnus, and Kallstroemia flowers. Bombus sonorus nests "in marshy flats near the coast," usually at the base of plants. These bumblebees generally nest underground, often in old pocket gopher burrows.

Subspecies
These two subspecies belong to the species Bombus sonorus:
 * Bombus sonorus flavodorsalis Franklin
 * Bombus sonorus sonorus Say, 1837