Synonyms and other taxonomic changes
Coelioxys octodentata; Coelioxys brevis; Coelioxys altilis; Coelioxys cressoni; Coelioxys coquilletti; Coelioxys megatricha; Coelioxys crassula; Coelioxys mediata; Coelioxys catalinica; Coelioxys atlantica
Female: 8-12 mm. Male: 8-10 mm
can be difficult to distinguish from sayi
, especially in the males. Separating characters include: 1- The distance from the lateral ocelli to the vertex margin is larger than the distance between the lateral ocelli 2- The legs tend to be orange in color all the way from the tarsi up through the femurs, but they may be darker in some specimens 3- The vertex tends to be reddish brown, but may also be black Of these characters, the vertex/ocelli measurement character is the most dependable. Be sure to measure this character carefully. Eye-balling it is likely to be misleading. Discover Life
British Columbia and California, east to Quebec, the New England states, and Florida.
Observed on goldenrod and mountain mint. The Hosts section on its Discover Life species page
lists known floral associations based on specimen records and images.
It's been reported that Coelioxys octodentatus has been reared from nests of Megachile mendica, M. brevis, M. centuncularis, M. perihirta, M. texana, M. onobrychidis, and M. rotundata (Baker J. R., 1975)
Baker J. R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50(12):649-730.