Wing vein posterior to cubitus (ex McAlpine 1981).
The anal vein (A1) ends directly distal to the posterior cubital cell in all Milichiidae. A1 and CuA2 can be well developed or weak. Well developed A1 and CuA2 are probably the plesiomorphic character state, because A1 and CuA2 are also well developed in the Acartophthalmidae and Carnidae. In both families the anal vein ends shortly before the wing margin. In the stem-species of the Chloropidae, A1 and CuA2 are lost apomorphically.
In the stem-species pattern of the Milichiidae and of the Chloropidae family-group CuA2 is bulging. In the stem-species of the Milichiinae, however, CuA2 meets A1 in an acute angle. Convergently with the Milichiinae, an angle between CuA2 and A1 is prese
nt in several Leptometopa species (ex Brake 2000).
The anterior branch of the anal vein is called A1 and the posterior branch A2 (ex McAlpine 1981).