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9. Head broad (a1, a2), with face strongly narrowed in ventral half; occipital carina (a2) present near occipital foramen, vertex sharply margined. Mandibles reduced, not capable of meeting medially, without denticles. Forewing (b1) with distinct tuft of enlarged, darkened setae near parastigma (sometimes represented only by distinctly darkened spot in the venation); also with transverse fuscate stripes.
8'. Head usually not similarly shaped (but convergent in some species. Either mandibles capable of meeting medially and with denticles, or occipital carina absent. Forewing without parastigmal tuft, often without fuscate areas.
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Image credits: Schauff, et al. (1997).