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 Ruzopria Engel , new subgenus ZooBank: urn:lsid:zoobank.org:act: 96E248D8-E8DB-4385-A782-6716ADC75570 TYPE SPECIES : Leioproctus mourei Toro, 1968 . DIAGNOSIS: This subgenus differs from the nominate subgenus by the wholly declivitous basal area of the propodeum that is poorly differentiated from the posterior surface, and with a granulose sculpturing that is rugulose at the extreme base. In the nominate group the basal area of the propodeum is smooth to finely imbricate and with a more defined, steeply sloping, subhorizontal zone. ETYMOLOGY: The new subgeneric name is a combination of the surname Ruz, honoring Luisa Ruz, the doyenne of Chilean melitology, and the stem of Belopria Moure. The gender of the name is feminine.