I love "apios", and am happy to have found them in the field a few times. But each time I only saw one, and they were quite wary. So I'd be absolutely enchanted if I were to encounter something like you experienced here! :-)

As you may know, apiocerids are difficult to ID without a view of structures under the two large claspers in the male. Finding a mating pair like yours...especially such a cooperative one...may provide one of the few opportunities to see and photodocument some of the diagnostic characters of the male terminalia without having to capture and dispatch a specimen (which I'm loath to do with things I like as much as apios!).

BTW, I'm wondering what prompted you to suggest A. haruspex atrifasciata here?

[PS: I'd like to extend you a warm, if somewhat tardy, Welcome to BugGuide! You've contributed a number of very good posts of Apioceridae...of which I'm much appreciative. I hadn't noticed them until today, and will try to revisit them when I get a chance...and work on ID's (as best I can with this difficult group). Hope to see further posts from you on BugGuide.]

that the male terminus seems to divide in half to allow the female attachment, completely odd compared to robbers.

Moved from ID Request.