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2. Vertex (a1) strongly convex, extending far above eye level; 1 or 2 grooves extending below each torulus to mouth margin. Male antenna always with nodose flagellomeres. Forewing (b1) with stigma often enlarged; discal area often with fuscate regions. Apical gastral tergite elongate in females, as long or longer than preceding tergite, covering most of the unusually long ovipositor sheaths.
2'. Vertex evenly rounded or flat in facial view, hardly extending above eye level; no grooves extending below toruli in most species. Male antenna sometimes without nodose flagellomeres. Forewing (bb1, bb2) variable, but usually without enlarged stigma or fuscate regions. Apical gastral tergite often shorter than preceding tergite.
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Image credits: a1: Askew (1968). b1: Boucek (1988). bb1: Coote (1994). bb2: Schauff, et al. (1997).
