Abdomen—bright black above and without hairs, except at the base of the first segment, which bristles with whitish ones. All the segments have a wavy transverse band, wider on the sides than in the middle, and approaching the posterior edge in proportion as the segment is further back. On the fifth segment the yellow band reaches the posterior edge. Anal segment—yellow, black at the base, bristling all over the dorsal surface with papillæ of a rusty red, which serve as base to the hairs. A row of like hair-bearing tubercules occupies also the posterior edge of the fifth segment. Below, the abdomen is a brilliant black, with a triangular yellow mark on each side of the four intermediate segments. Coxæ—black; thighs yellow in front, black behind; legs and tarsi—yellow; wings transparent. Male.—The zig-zag mark on the clypeus is narrower, or even absent; face then entirely yellow; abdominal bands very pale yellow, almost white. The sixth segment has a band like the preceding ones, but shorter and often reduced to two dots. The second segment has underneath it a longitudinal keel, raised and spine-shaped behind. The anal one has below it an angular, rather thick projection. Otherwise like the female. This Hymenopteron much resembles Bembex rostrata in size, shape, and arrangement of the black and yellow colouring, but differs markedly in the following characteristics:—The clypeus makes a triangle of three sides, while in other Bembecids it is rounded and convex. Also at the base is a large zig-zag band, formed by two rectangular marks joined together and softened by a silvery down, very brilliant under certain lights. The upper surface of the anal segment bristles with papillæ and reddish hairs—likewise the further edge of the fifth segment. The mandibles are only black at the tips, while in Bembex rostrata the base is also black. Their habits are equally unlike; B. rostrata especially hunts gadflies, while B. julii never catches large Diptera, but takes smaller kinds of very varying size. It is frequent in the sandy land of the Angles, round Avignon, and on the hill of Orange. Ammophila julii, H. Fab.