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6. Postmarginal vein (a1) 2x or more stigmal vein length. Males with scape (b1) grossly swollen.
6'. Postmarginal vein (aa1) about as long as stigmal vein. Scape not swollen.
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Image credits: a1-a2: Schauff, et al. (1997). b1: Gordh & Hendrickson (1979).