Note 3 — Appendix

Length, 18 to 20 millimetres.3 Black, with bristling whitish hairs on the head, the thorax and the base of the first segment of the abdomen. Long upper lip, yellow. Ridge-shaped shield, forming a sort of trihedral angle, of which one side, that of the fore-edge, is all yellow, while each of the two others is marked with a large rectangular black patch, touching the adjacent one, so that the two together form a chevron; these two patches and also the cheeks are covered with a fine silvery down. Cheeks and a median line between the antennæ, yellow. The back rim of the eyes has a long yellow border. Yellow mandibles, brown at the tips. First two joints of the antennæ, yellow underneath, black above; the others, yellow.