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Species Pseudomasaris edwardsii

Pseudomasaris edwardsii - male Pollen Wasp #3 - Pseudomasaris edwardsii - female Wasp - Pseudomasaris edwardsii Pseudomasaris edwardsii - female Pseudomasaris edwardsii - male Pseudomasaris sp. provisioning cells - Pseudomasaris edwardsii Odd Wasp - Pseudomasaris edwardsii - male ZE.45072_Pseudomasaris - Pseudomasaris edwardsii - male
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)
Genus Pseudomasaris
Species edwardsii (Pseudomasaris edwardsii)
Explanation of Names
Pseudomasaris edwasrdsii (Cresson 1872)
Females have a swelling on the anterior side of mesotibia (may be small or absent in some individuals):

Males have unique structure of the antennae, and a slight swelling on the frons:
WA-CA-Baja east to WY-CO-AZ(1); one adventitious occurrence in ON(2)
Mar to mid-Aug, mostly Apr-Jul, depending on altitude and flowering of food plants
Print References
Torchio P.F. (1970) The ethology of the wasp Pseudomasaris edwardsii (Cresson), and a description of its immature forms (Hymenoptera: Vespoidea, Masaridae). Contrib. Sci. L.A. County Mus. 202: 1-32. (Full text)
Internet References
Works Cited
1.Checklist of species of the subfamily Masarinae (Hymenoptera, Vespidae)
Carpenter J.M. 2001. American Museum novitates 3325. 40 pp.
2.Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the Northeastern Nearctic Region
Matthias Buck, Stephen A. Marshall, and David K. B. Cheung. 2008. Biological Survey of Canada [Canadian Journal of Arthropod Identification].