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 Walkerapis Engel , new genus ZooBank: urn:lsid:zoobank.org:act: 266F54B4-1F85-4EBF-A136-E17DA01AA560 TYPE SPECIES : Paracolletes subpunctatus Rayment, 1935 . DIAGNOSIS: This genus is superficially similar to Leioproctus s.str . , in that they both have finely ciliate inner metatibial spurs in females. However, the scape is short, not reaching the median ocellus and the pterostigma is short, shorter than half as long as the costal portion of the marginal cells. ETYMOLOGY: The new genus-group name honors Ken Walker, one of Australia’s foremost authorities on bees, combining his surname with the Latin noun apis (meaning, “bee”). The gender of the name is feminine.