So I got an email from Christiana Klingenberg yesterday pointing me to another key to male ants:
Yoshimura, M. & Onoyama, K. 2002. Male-based keys to the subfamilies and genera of japanese ants (Hymenoptera: Formicidae). Entomological Science, 5 (4): 421-443.
I don't have access to this article but have ordered it from my school library and will let you all know if it is useful or not.
She also mentions that:
"A few years ago Bodo Hasso Dietz and I had the same problem with males of Basicerotini and Attini. Checking out male and female wings we saw that both are very similar. So maybe comparing the wings of males with "identified winged females" could help. But this works only up the genus level, not for species."
Thanks for the tips! Anyone else?