Macropis (Macropis) nuda ( Provancher 1882 )

Gibbs, Jason, Ascher, John S., Rightmyer, Molly G. & Isaacs, Rufus, 2017, The bees of Michigan (Hymenoptera: Apoidea: Anthophila), with notes on distribution, taxonomy, pollination, and natural history, Zootaxa 4352 (1), pp. 1-160 : 121

Macropis (Macropis) nuda ( Provancher 1882)

County records: Allegan, Alpena, Arenac, Berrien, Cheboygan, Dickinson, Gladwin, Hillsdale, Huron, Ingham, Iosco, Isabella, Lapeer, Mackinac, Midland, Newaygo, Osceola, Otsego, Saginaw, Van Buren.

Notes. To our knowledge, only a single male of this oil-collecting bee has been collected in Michigan since 1959, although recent collections have been made locally in other states ( Wagner & Ascher 2008) and in eastern Canadian provinces ( Sheffield et al. 2004; Wagner & Ascher 2008). The bee has been collected historically across the entire LP, and its host plant is present widely in the state ( Voss & Reznicek 2012). Macropis nuda was among the species in the northeast modeled to be in decline based on historical records ( Bartomeus et al. 2013a). The possibility of a decline is supported by lack or extreme scarcity of this and other Macropis species in recent bee surveys made using bowl traps in portions of the mid-Atlantic region where it was once common such as the vicitiny of Washington, DC (S. Droege, pers. comm.). The lack of recent Michigan records of this species and of an associated cleptoparasite ( Epeoloides pilosulus , last collected in 1944; see entry above) may be due in part to insufficient collection effort focused on this species. Macropis specializes on Lysimachia ( Cane et al. 1983; Michez & Patiny 2005), a plant that grows in moist, often shaded ground ( Voss & Reznicek 2012). Localities with L. ciliata L. present, sometimes in abundance near extensive riparian zones, were visited by JG in Ingham, Clinton, and Benzie Counties, in some cases on numerous occasions, specifically to collect Macropis , but without success.

Material examined. Allegan Co.: Allegan, 2 Jul. 1936 (1 ♀ MSUC) ; Hillsdale Co.: Pittsford SGA, 41.866, - 84.522, 8 Jul. 2017 (1 ♂ TJWC) ; Ingham Co.: East Lansing , 20 Jul. 1937 (1 ♀ MSUC) ; Mackinac Co.: (no locality) 11 Aug. 1959 (1 ♂ MSUC) ; Midland Co.: (no locality) 5 Jul. 1938 (1 ♀ 1 ♂ MSUC) ; Osceola Co. : 3 Aug. 1940 (1 ♂ MSUC); Otsego Co.: 5 Jul. 1940 (1 ♂ MSUC) ; Saginaw Co.: (no locality) 14 Jul. 1940 (1 ♀ MSUC) .