Title: On the classification of North American <i>Chelostoma</i> (Hymenoptera: Megachilidae)
Abstract: A new subgenus of Chelostoma Latreille is established for the New World group historically placed in Foveosmia Warncke. These species, placed herein in Neochelostoma Engel & Griswold, new subgenus, are differentiated from the Palearctic Foveosmia and a modified key is provided to the subgenera of Chelostoma.