Figures 1–6.Details of Lithurgus huberi Ducke from Minas Gerais, Brazil (left column: 1, 3, 5) and Lithurgus atratus Smith (NHML syntypes) (right column: 2, 4, 6). Facial views (1, 2), detail of facial prominence (3, 4), and inner surface of metabasitarsus emphasizing the apical expansion and glabrous surface (5, 6).