NEW SPECIES OF PERDITA-(PYGOPERDITA) TIMBERLAKE OF THE P-CALIFORNICA SPECIES GROUP (HYMENOPTERA, ANDRENIDAE)

Three new species of Perdita (Pygoperdita) of the P. californica group are described from the southwestern United States. Perdita meconis NE W SPECIES, from the Mojave Desert, is associated with two genera of Pa paveraceae, Argemone and the endangered dwarf bearclaw poppy, Arctomec on humilis Coville. Perdita ute NEW SPECIES, from the San Rafael Deser t of central Utah, is also associated with Argemone. The floral associ ation of P. angellata NEW SPECIES, from the Colorado Plateau of northe rn Arizona, is unclear. A key to males is presented.