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The wings: top - G. viridipennis, bottom - G. acheron. Hancock (2008a) says that they can be separated by the lack of stigma in acheron, yet I would say that, at least in this specimen, faint yellowish stigma is present. Additionally, vein rq in acheron seems to have more proximal position (closer to the point of furcation of veins r2 and r3), and vein m-cu located more distally; and maybe in viridipennis vein a2 is somewhat curved inwards when reaching the wing margin. Male genitalia and, hopefully, report of new information later.