Sphecodes dichrous Smith 1853 ( dichrous group)

Syntype. ♀ ♂ USA, E. Doubleday (NHM).

= Sphecodes knetschi Cockerell 1898 (New synonymy)

Syntype. ♀ ♂ USA, Illinois, Terra Cotta, 25 Aug. 1897, 5 Sep. 1897, goldenrod, R. Knetsch (NMNH).

County records: Clinton, Ingham, Jackson, Livingston, Muskegon, Washtenaw.

Notes. Mitchell (1960) records this species under both names. Although the synonymy, first recognized by Mike Arduser, has been applied implicitly, it has not been published formally.