Stelis (Stelis) coarctatus Crawford 1916 ( coarctatus group)

= Stelis (Microstelis) vernalis Mitchell, 1962: 43 . New synonymy (by F. Parker and T. Griswold).

County records: Cheboygan, Kalamazoo, Livingston, Mason, Missaukee.

Notes. Mitchell (1962) did not include S. coarctatus in his treatment of the eastern species. The holotype female, deposited at NMNH, is from Kansas. The holotype female of S. vernalis, also deposited at NMNH, is from North Carolina. This species has been recorded as a cleptoparasite of Heriades carinata Cresson (see Sheffield et al. 2008). It was reared from Heriades carinata nests in Michigan by Matthews (1965 as vernalis), but also from Hoplitis (Proteriades) shoshone (Parker) in Nevada (Parker 1976), suggesting a broad host range.