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Extracted from: Timberlake P. H., (1975). The North American Species of Heterosarus Robertson (Hymenoptera, Apoidea). Universiry of California Press Berkeley. Los Angeles• London. ISBN: 0-520-09528-6.
This species was the first one described of a distinctive group of species known from Mexico, and the states of Colorado, New Mexico, and Arizona. Both sexes of this group have the propodeum, including basal area, rugosely sculptured, the pubescence of the mesonotum short and fine but with longer erect hairs interspersed, and the abdomen shining, weakly punctured, with the apical depression of the segment very broad. The group includes H. neomexicanus (Cockerell), H. elongatus (Friese), and the following new species: aristatus, asperatus, durangoensis, lopeziae, plearalis, and ventralis. Only neo-mexicanus and durangoensis of the additional species have been found in the United States. The known range of bakeri extends from the northern border of Colorado southward to the states of Pueblo, Morelos, Mexico, and Michoacan in Mexico, at high elevations (about five to eleven thousand feet). In Colorado this bee has been found as far east as seventeen miles south of Timpas in Otero County, and in Arizona as far west as Flagstaff. Visits of this bee to flowers of Potentilla, Phacelia, Monarda, Pseudocymopterus, Frasera, Sedum, Linum, Helenium, and Solidago have been recorded and to the list may be added Heterotheca, Euphorbia, Oxalis, and Lopezia.
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