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Bombus caliginosus (Frison, 1927) Bremus caliginosus Frison, 1927; Bremus caliginosus var tardus Frison, 1927
Life
Insecta
Hymenoptera
Apoidea
Apidae
Bombus
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Williams, Paul H., Robbin W. Thorp, Leif L. Richardson, and Sheila R. Colla. Bumble Bees of North America: An Identification Guide. Princeton University Press, 2014. http://www.jstor.org/stable/j.ctt6wpzr9.
Gives a common name of Obscure Bumble Bee.
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Extracted from Jonathan Koch, James Strange, Paul Williams.2012. Bumble Bees of the Western United States. A product of the U.S. Forest Service and the Pollinator Partnership with funding from the National Fish and Wildlife Foundation Status: Uncommon Select food plant genera: Baccharis, Cirsium, Lupinus, Lotus, Grindelia, Phacelia Tongue Length: Medium Distribution: Coastal areas from northern Washington to southern California Easily confused for B. vosnesenskii or B. vandykei Females (queens and workers, colors refer to hair) Thorax anterior to black band between wing bases yellow, scutellum black, T1-3 black, T4 yellow, T5 and T6 black, S3* and S4 with long yellow hairs apically, face square. Mid leg basitarsus with the distal posterior corner rounded. Cheek length as long as broad. Hair of the face and top of head yellow. On the side of the thorax, the lower anterior surface with predominantly black hair, corbicular fringes black. Hair length medium and uneven. *S refers to the sternites of the bumble bee, which are found on the ventral side of the abdomen. They
are analogous to the tergites (i.e. T1) that are found on the dorsal side of the abdomen. Therefore S3 translates to sternite 3. See page 26 for an example of this color character.
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Extracted from Bumble Bees and Cuckoo Bumble Bees of California by Thorp, R. (1983). Discussion. B. caliginosus belongs to the species group which includes B. centralis, /Javtfrons, and vandykei, and appears most closely related to B. vandykei. It differs from the California female color form of B. vandykei in the placement of the yellow hair band on the metasoma. In B. caliginosus, the yellow is on the apical half of tergite 4, while in B. vandykei it is on the apex of tergite 3. The pre-dominantly black males of B. caliginosus are dis-tinct from the predominantly yellow males of B. vandykei (cf. Figs. 115 and 124a). This species exhibits little color variation. One male was described as a new variety (tardus) by Frison (1927b) because it lacked the yellow band on the metasoma. No further specimens of this color variant have been seen, and it was synonymized by Stephen (1957). An arboreal nest of this species from Berkeley was described by Pitelka (1954). Johansen (1967) noted the similarity of B. cattginosus nests in Washington to those of B. mixtus. We have taken a surface nest in a garage in Eureka, Humboldt Co. It was using the cotton stuffing of a hammock stored behind some scrap lumber. | |||||||||||||||||||||||||||||||||||||||||
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