Hi Hejor, congratulations on a new genus of ants for CNM! Prolasius is not very often seen, being fairly uncommon and not often out and about when most people are. I've added some info on the genus and a link to more if you click on the CNM species link. While the images are not perfect, the clincher is in image 4 - if you zoom in on the head of the ant at the bottom of the picture, it has a very distinctively shaped clypeus (the front part of the head that the mandibles close under). Cheers, Jon