A new bee genus from the pampas of eastern Argentina, with appended notes on the classification of “ paracolletines ” (Hymenoptera: Colletidae) Author Engel, Michael S. Division of Entomology, Natural History Museum, and Department of Ecology & Evolutionary Biology, 1501 Crestline Drive - Suite 140, University of Kansas, Lawrence, Kansas 66045 - 4415, USA (msengel @ ku. edu). & Division of Invertebrate Zoölogy, American Museum of Natural History, Central Park West at 79 Street, New York, New York 10024 - 5192, USA. Author Gonzalez, Victor H. Undergraduate Biology, and Department of Ecology & Evolutionary Biology, 1200 Sunnyside Avenue, University of Kansas, Lawrence, Kansas 66045, USA (vhgonza @ ku. edu). text Journal of Melittology 2022 2022-01-24 2022 109 1 39 http://dx.doi.org/10.17161/jom.i109.16424 journal article 10.17161/jom.i109.16424 2325-4467 13146121 6C96BAB7-7AF6-4B8B-A2EF-08BD9F3A1344 Perditomorphina Engel , new subtribe ZooBank: urn:lsid:zoobank.org:act: 52F3912E-9118-499A-B1C9-28561C82BE7C TYPE GENUS : Perditomorpha Ashmead , 1899. DIAGNOSIS: This is a heterogeneous assemblage of genera and includes the majority of South American Neopasiphaeinae . The forewing may have two, or less frequently, three submarginal cells, with the length of the second medial cell 2.1× or more its width, but lacking the unique features of the previous subtribes. Unambiguous synapomorphies have been elusive. INCLUDED GENERA: Genera included are summarized in table 2.