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Subspecies Xylocopa tabaniformis orpifex

Large Black Bee - Xylocopa tabaniformis Bee - Xylocopa tabaniformis - female Carpenter Bee - Xylocopa tabaniformis - female Beige and black bee on salvia - Xylocopa tabaniformis - male Xylocopa sp. - Xylocopa tabaniformis Bumble Bee - Xylocopa tabaniformis Xylocopa tabaniformis? - Xylocopa tabaniformis - male Xylocopa tabaniformis? - Xylocopa tabaniformis - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Ants, Bees and Stinging Wasps)
No Taxon (Anthophila (Apoidea) - Bees)
Family Apidae (Cuckoo, Carpenter, Digger, Bumble, and Honey Bees)
Subfamily Xylocopinae (Carpenter and Small carpenter Bees)
Genus Xylocopa (Large Carpenter Bees)
No Taxon (Subgenus Notoxylocopa)
Species tabaniformis (Horse-fly Carpenter Bee)
Subspecies orpifex (Xylocopa tabaniformis orpifex)
Remarks
A brief and very readable 1916 account of the life history of X. tabaniformis ssp. orpifex, cited in Hurd(1) and other references, can be found at this link.

Among the cohabitants of the larval nests of X. t. orpifex mentioned therein are:
A parasitic bee fly, Xenox (=Spongostylum) delila;
A tenebrionid beetle, Tribolium (=Aphanotos) brevicornis; and
A moth referred to the old family "Phycitidae"—presumably now subsumed in the tribe Phycitinae of current family Pyralidae.
In light of the descriptions of the feeding habits of Phycitinae on page 188 of Powell & Opler(2), and those of tenebrionids on page 213 of Evans & Hogue(3), the moth and beetle may be nest inquilines rather than true parasites of X. t. orpifex.
Works Cited
1.The Carpenter Bees of California
Paul D. Hurd, Jr. 1955. University of California Press.
2.Moths of Western North America
Powell and Opler. 2009. UC Press.
3.Field Guide to Beetles of California
Arthur V. Evans and James N. Hogue. 2006. University of California Press.