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Subfamily Masarinae - Pollen Wasps

Pseudomasaris vespoides - male - female Pseudomasaris marginalis - male Pseudomasaris wheeleri - male Male Pollen Wasp - Pseudomasaris vespoides - male Female Pseudomasaris on Phacelia Mutabilis - Pseudomasaris zonalis - female Pseudomasaris zonalis - male Pollen Wasp? - Pseudomasaris Bembicini?? - Pseudomasaris
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)
Superfamily Vespoidea (Yellowjackets and Hornets, Paper Wasps; Potter, Mason and Pollen Wasps and allies)
Family Vespidae (Yellowjackets and Hornets, Paper Wasps; Potter, Mason and Pollen Wasps)
Subfamily Masarinae (Pollen Wasps)
14 species in North America, all in the genus Pseudomasaris.
10-20 mm
Yellow and black. FW with only two submarginal cells. Clubbed antennae.
Only in the West.
The larvae- unlike those of other Vespids- eat pollen and nectar instead of insects, etc.
Life Cycle
The females make nests of mud or sand attached to twigs or rocks. They provision the nests with pollen and nectar and lay their eggs. The eggs hatch into larvae that eat the provisions, then pupate and emerge as adults.
Print References
Bradley, J. C. (1922). The taxonomy of the Masarid wasps, including a monograph of the North American species. Univ. Cal. Publ. in Entomol. Vol. 1, No. 9, pp369-464. (Full Text)
Richards, O.W. (1963). The Species Pseudomasaris Ashmead (Hymenoptera, Masaridae). U.C. Press. - Contains key to species.
Richards, O.W. (1966). New records of Pseudomasaris Ashmead (Hymenoptera: Vespoidea, Masaridae), with notes on P. phaceliae Rohwer and P. cazieri R.M. Bohart. Proc. Royal Ent. Soc. London (B), 35 (3-4), pp. 47-55.
Gess, Sarah K. (1996). The Pollen Wasps - Ecology and Natural History of the Masarinae. Harvard University Press. (1)
Carpenter, J.M. (2001). Checklist of species of the subfamily Masarinae (Hymenoptera, Vespidae). American Museum novitates; no. 3325. (Full Text)
Internet References
Works Cited
1.Borror and DeLong's Introduction to the Study of Insects
Norman F. Johnson, Charles A. Triplehorn. 2004. Brooks Cole.