Male mesotibia showing anterior (ap) and posterior (pp) felty patches. The presence or absence of setae in the area between the medial margin of the posterior patch and the anterior margin of tibia (aa) distally, is an important feature in species identification. 1 E. coerulescens (Mexico: Nuevo León; ECO-TAP-E-104040) 2 E. oliveri (holotype) 3 E. simillima (holotype).

  Part of: Gonzalez VH, Griswold T, Simões M (2017) On the identity of the adventive species of Eufriesea Cockerell in the USA: systematics and potential distribution of the coerulescens species group (Hymenoptera, Apidae). Journal of Hymenoptera Research 55: 55-102.