Myrmecocystus

Identification
Myrmecocystus can be distinguished from all Nearctic genera of Formicinae by the elongated maxillary palpi, of which the fourth segment is as long as, or longer than, the combined lengths of the two following segments.

Myrmecocystus subgenus/species-groups.

Myrmecocystus species keys.

Nomenclature

 *  MYRMECOCYSTUS [Formicinae: Lasiini]
 * Myrmecocystus Wesmael, 1838: 770. Type-species: Myrmecocystus mexicanus, by monotypy.
 * Myrmecocystus junior synonym of Cataglyphis: Roger, 1863b: 12; Mayr, 1863: 431.
 * Myrmecocystus revived status as genus: Forel, 1878: 372.
 * Myrmecocystus senior synonym of Endiodioctes, Eremnocystus: Snelling, R.R. 1981: 403.
 * ENDIODIOCTES [junior synonym of Myrmecocystus]
 * Endiodioctes Snelling, R.R. 1976: 25 [as subgenus of Myrmecocystus]. Type-species: Myrmecocystus melliger, by original designation.
 * Endiodioctes junior synonym of Myrmecocystus: Snelling, R.R. 1981: 403.
 * EREMNOCYSTUS [junior synonym of Myrmecocystus]
 * Eremnocystus Snelling, R.R. 1976: 92 [as subgenus of Myrmecocystus]. Type-species: Myrmecocystus creightoni, by original designation.
 * Eremnocystus junior synonym of Myrmecocystus: Snelling, R.R. 1981: 403.