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Hi Tristram
Thanks for the input but I'm confused. Huckett's 1965 and 1975 keys describe H. vespertina's halteres as "browned, dark purple or blackish" with H. umbratica and H. affinis having "mainly yellow or partly reddish tinged" halteres. That's also true for Malloch's 1921 key. Gregor et al. (2002) don't describe the haltere color in this genus but they equate H. vespertina with Malloch's H. affinis. What's the current state of the taxonomy of this genus?

Thanks again

Steve