Fireflies

So I wanted to get some shots of fireflies. I told a friend of mine I would try to get a shot of them in the yard. I am still not sure how I should photograph them, but with this picture I set it up on the tripod and delayed it 2 sec. The shutter speed is set as low as my camera would go. They turned out ok in the jar, but they just were not bright enough in the yard. I might have the ISO too low. Tomorrow night, if it isn't raining, I will try again with a higher ISO. Something about a bug that can light it's behind is SO cool!