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Obscure bumble bee
The obscure bumble bee (''Bombus caliginosus'') is a species of bumblebee native to the West Coast of the United States, where its distribution extends from Washington through Oregon to Southern California,〔(''Bombus caliginosus''. ) NatureServe. 2012.〕 as far south as the San Jacinto Mountains.〔Ebeling, R. (2002). (Chapter 9, part 2: Pests Attacking Man and His Pets. ) ''Urban Entomology''. UC Riverside.〕
== Description ==
The obscure bumblebee is very similar to the yellow-faced bumblebee (''B. vosnesenskii''), and the two can only be definitively told apart by the structure of the male genitalia.〔 The obscure bumblebee tends to have longer hairs, however, and yellow hairs are found on the underside of the abdomen, where ''B. vosnesenskii'' has only black hairs.〔McFrederick, Q.S. (Guide to the ''Bombus'' of San Francisco. ) The Bee Inventory Plot. San Francisco State University.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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