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

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

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington


Species Vespula pensylvanica - Western Yellowjacket

Vespula Pensylvanica Nest - Vespula pensylvanica Yellowjacket for ID - Vespula pensylvanica - female Western Yellowjacket - Spring Queen - Vespula pensylvanica - female Wasp nest - Vespula pensylvanica Mini Yellow Jackets - Vespula pensylvanica Vespula pensylvanica? - Vespula pensylvanica Vespidae - Vespula pensylvanica - female Vespula 517A 9134 & 9135 - Vespula pensylvanica - 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 Vespinae (Hornets and Yellowjackets)
Genus Vespula
Species pensylvanica (Western Yellowjacket)
Explanation of Names
Vespula pensylvanica (de Saussure 1857)
Forewing: workers 8.5–10.5 mm, ♀ 12.5–14.5 mm, ♂ 12.5–14.0 mm(1)
w NA (BC-CA to MB-WI-TX) to Mexico; adventive in ON, HI(1)
Life Cycle
Nest entrance • Nest • Prepupae, pupae and adults
Print References
Internet References
Works Cited
1.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].
2.The Vespinae of North America (Vespidae, Hymenoptera)
L.S. Kimsey and J.M. Carpenter. 2012. Journal of Hymenoptera Research Vol. 28: 37–65.