Unknown queen ants

I caught these ant on 10 July in the afternoon. The location is Belgium. 

I tried getting one of them out of the test tube and stressed them out a lot... I hope I didn't kill them with that stress (the one that dropped out literally left a white trail for 4cm...). I thought they where solenopsis fugax but apparently they only fly in August/September so now I'm thinking tetramorium caespitum since they look like another ant that I caught a little earlier. The only thing is that those Yellow Marks are not that clear on caespitum.

Queen ant identification

This ant was caught on 30/06/2019 Belgium. She is 5ish mm in length.

The picture was taken using my phone and the ant was in a glass container so the quality isn't really good.

The ant is very calm,  I walked 2km with it on my hand and it hardly tried to move.

I currently have her I a semi-clausteral setup in case she is a queen.