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| Taxon | Status | Relationship Type |
|---|---|---|
| Formica rufa subsp. difficilis Emery | Original name/combination | member |
| Formica rufa difficilis Emery | Subsequent name/combination | member |
| Formica (Formica) difficilis Emery | Subsequent name/combination | member |
| Formica habrogyna Cole | Original name/combination | |
| Formica difficilis Emery | Subsequent name/combination | member |
| Citation | Annotation |
|---|---|
| Cole A. C., 1939: 413. | original description |
| Creighton W. S., 1950: 500. | junior synonym of Formica difficilis Emery |
| Cole A. C., 1940: 73, 76. | description, keyed, distribution |
| Cole A. C., 1943: 389. | junior synonym of Formica difficilis Emery |
| Smith M. R., 1947: 623. | included in list of species of microgyna group of Formica (Formica) of the United States |
| Determiner(s) | # of Records |
|---|
| Collecting Method | # of Records |
|---|