A female will lay just one egg inside the chamber and then place paralyzed caterpillars inside as well before sealing the nest at the opening. The parasitic wasp larva will eat the caterpillars before digging its way out of the chamber.
Details of the:
Category: Bee, Ant, Wasp and Similar
Common name: Potter Wasp
Scientific Name: Eumenes fraternus
Size (Adult, Length): 9mm to 19mm (0.35in to 0.75in)
Identifying Colors: cream, black, yellow, white, purple
Additional Descriptors: skinny, iridescent, flying, stinging
North American Reach (Though Not Limited To*): Alabama; Arkansas; Connecticut; Delaware; Florida; Georgia; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Nebraska; New Hampshire; New Jersey; New York; North Carolina; North Dakota; Ohio; Oklahoma;Pennsylvania; Rhode Island; South Carolina; South Dakota; Tennessee; Texas; Vermont; Virginia; West Virginia; Wisconsin; Wyoming; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario; Prince Edward Island; Quebec; Mexico
* Keep in mind that an insect's reach is not limited by lines on a map and therefore may appear in areas/regions/states beyond those listed above.