ColletesbradleyiMitchell is a rare Nearctic bee known from only three females collected within a 30-km range. Details on life history and the male form have never been reported. Our study provides the first description of the male and its diagnosis. We also present novel observations on floral associations, as well as the floral and pollinator communities in the vicinity of each encounter, to help characterize habitat targetable for future research and conservation. Findings come from five sites where we collected a total of ten females and eleven males. We obtained additional specimen records by examining museum materials, with one extending the range by at least 750-km. We found both sexes of C. bradleyi in direct association with the semitoxic plant Sheep Laurel, Kalmia angustifolia L. Males rapidly patrolled patches of K. angustifolia while females visited inflorescences to drink nectar and gather pollen. Previous work has shown K. angustifolia possesses key morphological features that should enhance specialist-pollinator interactions, and our findings suggest C. bradleyi is a specialist on the plant. We hope that our observations can aid in the discovery and preservation of new populations, and that future focus will be placed on evaluating the conservation status of this species.