These bees are associated primarily with members of the subgenus Chelostomoides, of genus Megachile as hosts. Thus, M. exilis, M. campanulae, M. georgica, and M. rugifrons, could be hosts in Florida.
Sternum 6 either broadly or narrowly rounded, the sides neither notched, sinuate nor incurved..C. modestus
Sternum 6 either notched laterally, or incurved on each side to form an apical, narrowed projection..C. obtusiventris
Basal concavity of abdomen with an elevated, subcarinate rim..C. modestus
Basal concavity of abdomen not carinate ..C. floridanus
County Records: Listed for Florida by Mitchell
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Notes: Mitchell described this species from the male specimens only. Occurs from NC to Florida
County Records: Listed for Florida by Mitchell
Locations:
Dates: March-August
Hosts: M. campanulae wilmingtoni
Notes: Photos here by HGH are specimens from Louisiana. Krombein reared this species. Probably from Highlands county?
County Records: Listed for Florida by Mitchell, endemic?
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Notes: Known only from a single female related to C. modesta but distinguishable.