If you keep/have kept Aphaenogaster spp., then you probably know that they aren't big fans of sweets.
Aphaenogaster is almost completely insectivorous, even workers consume insects. For my colony of A. rudis, I feed them mostly on insects but try to give them sugar in the form of honey or sugar-water about every week or so. They never seem to accept it. I know that they can survive almost completely on insects, I still sometimes get nervous that their lack of sweets will catch up to them.
Today, I tried giving them some hummingbird nectar for a change. For once, they accepted it. There were workers constantly drinking until it dried out. Then they began to break off small chunks from the dried droplet and dragging them into the nest where several ants would cluster around it.
I'm not sure if I've found a sugar source that all Aphaenogaster will accept, or if it's just my colony. If anyone else has Aphaenogaster, feel free to try this and see if it works.
Just thought I'd share my small discovery.