Wing length 7-9.75 mm. External images For terms see
Morphology of Diptera Winglength 7-9-75 mm. Elongated body. Lunula black with a black mark above it. Face entirely yellow. The alula is a narrow, rectangule. Tergite 2 with broad, square yellow marks. Tergites 3 and 4 with broad yellow bands which extend to the abdominal margin and have little points (one pointing forwards and the other backwards). See references for determination. . The male genitalia are figured by Hippa (1968). Larva described and figured by Rotheray (1994). ==Distribution==