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Photo#126681
Chunky wasp or bee - Dolichovespula maculata

Chunky wasp or bee - Dolichovespula maculata
Pineview Reservoir, Morgan County, Utah, USA
June 17, 2007
Size: 1 inch
This was a large CHUNKY wasp. It was so heavy-looking and wide it flew like a cargo plane. Could it be a parasitic wasp?

Wasp
I'd say Dolichovespula maculata (Bald-faced Hornet), although I'm not sure if the three look-alike species are found in Utah. From the individuals I've seen the white markings on the abdomen look a lot like D. maculata, but I'm no expert on Vespids.

 
You're quite right
This is inded a D. maculata worker. Other similarly-looking species have jet-black, not chocolate brown, compound eyes, and ocular sinuses are not wholly white like here. And 2nd abominal segment is wholly black only in D. maculata too.

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