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1. Toruli unusually low (a1, a2), near mouth margin. Forewing (b1) with patches of dark or thickened setae, especially near parastigma and base of marginal vein (sometimes represented only by conspicuously darkened spot in venation). Notauli complete; scutellum without submedian grooves.
1'. Toruli near or above lower eye margin (aa1). Forewing without patches of especially thickened setae (though often with fuscate patches on forewing disc). Notauli often incomplete; scutellum usually with submedian grooves.
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Image credits: a1, a2, b1: Boucek (1976). aa1: Askew (1968).