Bombus melanopygus, the black-tailed bumble bee,Bombus melanopygus. Natural History of Orange County, California. School of Biological Sciences, University of California, Irvine. black tail bumble beeHatfield, R., et al. 2014. Bombus melanopygus. The IUCN Red List of Threatened Species. Downloaded on 04 March 2016. or orange-rumped bumblebee,Bumblebees: photo gallery. E-Fauna BC. Department of Geography, University of British Columbia, Vancouver. Accessed 4 March 2016. is a species of bumblebee native to western North America.

This bee is widely distributed across western North America, from the Pacific to the Rocky Mountains, and from Alaska to Baja California.

There are two forms of the black-tailed bumblebee:

Red form (“red butts,” Bombus melanopygus melanopygus) found primarily in higher latitudes of Oregon and points north, and in the Mountain West

Dark color form (Bombus melanopygus edwardsii) is most common in California and southern Oregon

(The second and third abdominal segments are red in northern populations and black in southern; individuals with black segments were previously known as Bombus edwardsii, a separate species. Genetic analyses support the conclusion that the two forms are the same species, with B. edwardsii as a synonym.Owen, R. E., Whidden, T. L., & Plowright, R. C. (2010). Genetic and morphometric evidence for the conspecific status of the bumble bees, Bombus melanopygus and Bombus edwardsii. Journal of Insect Science, 10(1), 109.)

This bumblebee can utilize a number of habitat types, including agricultural and urban areas. It is "one of the few bumblebees still found regularly in San Francisco".NatureServe. 2015. Bombus melanopygus. NatureServe Explorer 7.1 Accessed 4 March 2016. It feeds on many types of plants, including manzanitas, Ceanothus, goldenbushes, wild buckwheats, lupines, penstemons, rhododendrons, willows, sages, and clovers. It nests underground or aboveground in structures.

This species is a host to the zombie fly (Apocephalus borealis).Apocephalus borealis. Featured Creatures. University of Florida IFAS. Publication Number EENY-605. October 2014.

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