Key to the females of the known species of Megachile (Austrosarus)

1. Surface of fourth and fifth metasomal tergites obscured by covering of golden appressed hairs. Tergites without apical bands of hairs. Apical margin of clypeus uneven frankieana

­ Surface of metasomal tergites clearly visible; the first to fifth tergites bearing apical bands of short hairs of contrasting colour ..................................................................... 2

2. Distance from lateral ocellus to hind margin of head equal to that between lateral ocelli. Tergites without apical bands of hairs. Apical margin of clypeus uneven. Apical fascia of fourth sternite present on <12% of each side of total width. Larger species; fore wing 8.6 mm long candanga

­ Distance from lateral ocellus to hind margin of head <60% that between lateral ocelli. Tergites without apical bands of hairs. Apical margin of clypeus even. Apical fascia present on>18% of each side of total width of fourth sternite. Smaller species; fore wing 6.5 mm long ................................................................................................... diasi