A natural group of species, which briefly may be characterized as follows: Wings approximately unicolorous, stigma distinct, the ante stigmal spot always extends into cell 1st M2, but is interrupted in the outer end of cell R in most of the species. The eighth sternite of the male is prolonged and narrowed posteriorly, except devia. The hypopygium is of moderate size. The ninth tergite, generally small, is emarginate in the middle, except fragmentata. The pleural suture is distinct, except devia—the pleurite prolonged into a process, generally long and twisted, hornlike, rarely into an acutely pointed cone, derbyi, or simply tipped by a sharp point, devia. The ovipositor is very short, the upper valves generally rounded or oval, in some species ending in a downward curved point, giving thus a beaklike appearance; the lower valves scaphoidal. In all the specimens in my collection, the posterior end of the abdomen, especially the males, is curved upward and sometimes backwards towards the abdominal tergum. Whether this also obtains in the living insect I have no means to know.