Among some hymenoptera recently received from Mr. A. Gordon Leavitt, of St. John, N. B., is a very interesting male of Thyreopus latipes, Smith. The sexes of this genus are readily separated, as the males have the anterior legs remarkabty modifed; the tibiæ: especially being developed in broad shields, or leaf-like expansions. The antennæ are simple in the female, but those of the male have the flagellum fusiform and compressed. In T. latipes the basal joints are broad, and the flagellum narrows from the second joint to the apex.