Myrmica rubra or M. ruginodis?

                    Myrmica rubra or M. ruginodis?

Observation - Myrmica rubra or M. ruginodis? - UK and Ireland. Description: Red ant species observed on Common Vetch, Vicia sativa. A determiner ID would be very much appreciated. Note that photos were taken 2.5.14.

Red ant species observed on Common Vetch, Vicia sativa. A determiner ID would be very much appreciated. Note that photos were taken 2.5.14.