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Compare Myopa vesiculosa Say, 1823. I am not sure it isn't a Thecophora.

See revisions by Camras:

Camras, S. 1945. A study of the genus Occemyia in North America (Diptera: Conopidae). Ann. ent. Soc. Am. 38: 216-222.
Camras, S. 1953. A review of the genus Myopa in North America (Diptera: Conopidae). Wasmann J. Biol. 11: 97 -1t4.