Megachile tucumana Vachal 1908: 241 242. Female and male. Female designated here as lectotype. Type locality: Lara (4000m), Tucuman [Argentina]. Type repository: MNHN. Examined. Left mandible glued.
Subgenus Leptorachis Mitchell
Megachile (Leptorachis) Mitchell 1934: 303, 308. Type species: Megachile petulans Cresson 1878. Original designation. Michener et al 1994: 149, Michener 2000: 559.
Pseudocentron (Leptorachis) Mitchell 1980: 56.
Pseudocentron (Grafella) Mitchell 1980: 56. Type species: Pseudocentron (Grafella)
crotalariae Schwimmer in Mitchell 1980. Monotypy and original description. Synonymy of Michener 2000: 559.
Pseudocentron (Leptorachina) Mitchell 1980: 56. Type species: Megachile laeta Smith 1853. Original designation and monotypy. Synonymy of Michener 2000: 559.
Subgenus Leptorachis Mitchell
Megachile (Leptorachis) Mitchell 1934: 303, 308. Type species: Megachile petulans Cresson 1878. Original designation. Michener et al 1994: 149, Michener 2000: 559.
Pseudocentron (Leptorachis) Mitchell 1980: 56.
Pseudocentron (Grafella) Mitchell 1980: 56. Type species: Pseudocentron (Grafella)
crotalariae Schwimmer in Mitchell 1980. Monotypy and original description. Synonymy of Michener 2000: 559.
Pseudocentron (Leptorachina) Mitchell 1980: 56. Type species: Megachile laeta Smith 1853. Original designation and monotypy. Synonymy of Michener 2000: 559.