There were lots of insects enjoying Cathy’s mountain mint (Pycnanthemum muticum) today, including this potter wasp. I’ve narrowed it down to the genus Euodynerus of which there are 19 local species. Beyond that, I need better pictures and different views.
There is a good key to the genus here: http://www.biology.ualberta.ca/bsc/ejournal/bmc_05/key_euodynerus.html. I also found a good Hymenoptera glossary here: http://www.diapriid.org/projects/32/public/ontology/.