Hind legs of female halictine bees. a, The cleptoparasitic Sphecodes monilicornis (Kirby), showing the lack of a scopa and penicillus and the presence of large tibial spicules; b, Lasioglossum malachurum (Kirby), showing the strong scopa from the trochanter to the basitarsus and the distal process and penicillus on the basitarsus. Drawing by D. J. Brothers, from Michener, 1978b. (source: Michener, 2007)