Female: 8-13 mm. Male: 7-12 mm
Nebraska to Quebec and the New England states, south to Texas and Florida.
The Hosts section on its Discover Life species page
lists known floral associations based on specimen records and images.
Coelioxys modestus hosts include Megachile centuncularis and M. campanulae wilmingtoni. (Mitchell, T.B., 1962)
Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152.