Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

BugGuide is a National Moth Week Partner. How to add your National Moth Week 2021 photos. July 17-25.

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

National Moth Week 2020 photos of insects and people.

Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Previous events


Genus Pseudomasaris

10 May 2010 - Mud Dauber Nest - Pseudomasaris Pseudomasaris vespoides - female Pseudomasaris wheeleri - male Odd Wasp - Pseudomasaris edwardsii - male Death Valley Pollen Wasp on Phacelia calthifolia - Pseudomasaris basirufus - male Wasp - Pseudomasaris maculifrons - female Pseudomasaris - Pseudomasaris vespoides Wasp - Pseudomasaris edwardsii
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
Explanation of Names
Pseudomasaris Ashmead 1902
14 spp. in our area, 15 total(1)
A combination of Yellow, White, Black, and Red.
Fore wing with only two submarginal cells.
Clubbed antennae.

key to spp. in(2)
w NA north to 50°N(3)
Semiarid to arid areas where preferred plants occur. Often found in places with lots of rocks to build nests on.
Feb to Aug. More common in the spring.
Mainly oligolectic, favoring Phacelia, Eriodictyon (both Hydrophyllaceae s.s.), or Penstemon species. Adults may take nectar from plants of other families; females provision offspring with a mixture of pollen and nectar.(3)
Life Cycle
Solitary and likely univoltine.
They build mud nests on rocks which can be difficult to find.
Print References
Parker F.D. (1967) Notes on the nests of three species of Pseudomasaris Ashmead (Hymenoptera: Masaridae). Pan-Pac. Entomol. 43: 213-216 (Full text)

Ashmead, Willam H. (1902). Classification of the fossorial, predaceous and parasitic wasps, or the Vespoidea. The Canadian Entomologist., 34, 219–231. (Full Text Here) Genus erected in couplet 10.
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.New records of Pseudomasaris Ashmead (Hymenoptera:Vespoidea, Masaridae), with notes on P. phaceliae Rohwer and P. cazieri Bohart
Richards O.W. 1966. Proc. R. Ent. Soc. London (B) 35(3-4): 47-55.
3.The Pollen Wasps
Sarah K. Gess. 1996.