The subgenus Hoplostelis (Austrostelis), proposed by Michener and Griswold (1994), is here raised up to the genus levei: Austrostelis stat.n. The following nomenclatural changes are introduced: Austrostelis catamarcensis (Schrottky, 1909) comb.n. (= Dianthidium nudum Schrottky, 1909syn.n. = Ste/i4-a//e«aCockerell, 1919syn.n. = Stelis argentina Friese, 1925 syn.n. = Stelis magna Friese, 1925 syn.n.); Austrostelis iheringi (Schrottky, 1910) comb.n.; Austrostelis zebrala (Schrottky, 1905) comb.n. Lectotypes are designated for: Dianthidium catamarcense Schrottky, 1909, Dianthidium iheringi Schrottky, 1910, Dianthidium nudum Schrottky, 1909, and Dianthidium zebratum Schrottky, 1905. A key for species and illustrations are also provided.
Austrostelis; Anthidiinae; Megachilidae; taxonomy