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16. Upper portion of frons (a1) strongly projecting anteriad, dorsal surface of head very long; occiput very strongly concave, sharply margined. Clypeus set off by distinct sulci. Scape and 2 basal flagellomeres (b1) strongly flattened in females; males with a whorl of long setae (c1) at the base of each flagellomere; peg sensilla (d1: sa) of flagellum elongate, strongly asymmetrical (requires slide mounting). Forewing (e1) distinctive in shape: submarginal vein only slightly shorter than marginal vein and disc distinctly expanded beyond venation; disc with distinct longitudinal fuscate band branching apically (but sometimes fuscate area reduced to traces near venation in males).
Callifrons Schauff, Yoshimoto, & Hansson, 1994
16'. Upper portion of frons very rarely (some species of Closterocerus) similarly shaped, and never to this degree. Clypeus often not set off by distinct sulci. Flagellum usually not flattened (except in Closterocerus (bb1)), and never with only basal funicular segments flattened; flagellum sometimes without whorls of setae in males; flagellar peg sensilla usually not asymmetrical (dd1: sa) or only slightly asymmetrical (dd2: sa), strongly asymmetrical only in some Omphale. Forewing rarely with similar markings (exception: Closterocerus tau Girault, (ee1)).
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Image credits: a1: Schauff, et al. (1997). b1, c1, e1: Schauff, et al. (1994). bb1: Schauff (1991). d1, dd1, dd2: Hansson (1996a). ee1: Hansson (1994a).