Protandrena (Pterosarus) aestivalis (Provancher, 1882)

Portman, Zachary M., Gardner, Joel, Lane, Ian G., Gerjets, Nicole, Petersen, Jessica D., Ascher, John S., Arduser, Mike, Evans, Elaine C., Boyd, Crystal, Thomson, Robin & Cariveau, Daniel P., 2023, A checklist of the bees (Hymenoptera: Apoidea) of Minnesota, Zootaxa 5304 (1), pp. 1-95 : 27

Protandrena (Pterosarus) aestivalis (Provancher, 1882)

Counties: Aitkin, Anoka, Beltrami, Benton, Big Stone, Carlton, Carver, Clearwater, Hennepin, Isanti, Polk, Ramsey, Rock, Saint Louis, Sherburne, Washington, Winona.

Comments: There are two subspecies of Pr. aestivalis: Pr. a. aestivalis and Pr. a. muesbecki. The specimens in Minnesota contain forms that match both subspecies due to variation in the face markings. It is unclear whether the subspecies represent distinct taxa.