A single fly, bred from a larva on oak at Boston, Mass., appears to belong to this species. The fly differs from Mr. Cresson's description in that all the tarsi are blackish; the abdomen above is largely blackish; there is no luteous tint discernible on the laterl margin of middle lobe of mesothorax; the anterior and posterior margins of the luteous stigma are blackish and the veins are nearly black.