Note 4 — Appendix

Length, 16 to 22 millimetres.4 Abdominal petiole consisting of the first segment and half the second. Third cubital narrowed towards the radial. Head, black, with silvery down on the face. Antennæ, black. Thorax, black, with transverse stripes on its three segments, darker on the prothorax and the mesothorax. Two patches on the sides and one behind either side of the metathorax, covered with silvery down. Abdomen, bare and shiny. First segment, black. Second segment, red in the part narrowed into a petiole and in the widened part. Third segment, all red. The others, a beautiful, metallic indigo-blue. Legs, black, with silvery down on the hips. Wings, slightly reddish. Builds her nest in October and stocks each cell with two medium-sized caterpillars.