19. Myrmica rufa ^HNS.

Worker, length 9 - 48 th of an inch, head shorter, proportionally, and eyes larger; thoracic spines longer, straighter; 1 st abdominal pedicle longer and less raised than in the last; entirely of a rufous colour. This is a very closely allied species and is found in the same localities as the last. Had I found it in a different tract of country I would have perhaps considered it as a climatal variety, but its large size, and the few points enumerated above lead me to view it as distinct. Its habits are similar.