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Subfamily Vespinae - Hornets and Yellowjackets

EARLY/MID-SEASON AERIAL YELLOWJACKET NEST - Dolichovespula arenaria Yellow Jacket - Probably Vespula pensylvanica - Vespula pensylvanica Yellowjacket ID - Vespula maculifrons - male Yellow Jacket Sept 14 - Vespula vidua - male Bald Faced Hornet - Dolichovespula maculata - male D. maculata nest - Dolichovespula maculata bald-faced hornet - Dolichovespula maculata Downy Yellowjacket - Vespula flavopilosa
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Bees, Ants, and other Stinging Wasps)
Superfamily Vespoidea (Ants, Stinging Wasps, and Hornets)
Family Vespidae (Yellowjackets, Paper Wasps, and Hornets; Potter, Mason and Pollen Wasps)
Subfamily Vespinae (Hornets and Yellowjackets)
Identification
Two online resources:

(1) "Yellowjackets & Hornets through a Lens" in Forums: Photo Focus Groups for a key to all species with images in BugGuide

(2) Key to North American genera of Vespinae in the Identification Atlas of the Vespidae of the northeastern Nearctic region.
Internet References
For an updated Checklist of names see HERE. Thanks to Chuck Entz for this reference.