We review the six species of non-metallic Osmia (Melanosmia) found in North America, including the description of two new species found in Canada and the northern United States: Osmia (Melanosmia) aquilonaria sp. n., and Osmia (Melanosmia) nearctica sp. n., respectively belonging to the inermis and xanthomelana species groups. We additionally provide keys to the non-metallic Melanosmia found in North America, and keys to the palearctic Melanosmia based on study of the type specimens of Osmia disjuncta Tkalců, O. ephippiata Smith, O. ishikawai Hirashima, and O. pamirensis Gussakovskij.