Another resource is the Japanese ant image website, which has a male ant key to the Japanese subfamilies. I will give it a try and see if it is helpful. Also, see the comment by Alex (I assume Wild) under Identifying male ants II. He has some hints on Linepithema males. He also suggests that the best course of action is simply to look at a lot of males in the genera and species that I have already identified and just try to get the general feeling for what the males look like. That seems like a great idea but I have so many friggin' genera and species that I find the prospect a little overwhelming.