Catalogue of the hymenopterous insects in the collection of the British Museum. Part VI. Formicidae. Author Smith, F. text 1858 British Museum London http://antbase.org/ants/publications/8127/8127.pdf book 8127 60. Myrmica dimidiata . Myrmica dimidiata, Say , Bost. Journ. Nat. Hist. i. 293. 5. Hab. North America.