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Bolton's Catalogue ha scritto:Diagnosis of the Family FORMICIDAE
Eusocial vespoid aculeates with a wingless worker caste, forming perennial colonies. Head prognathous in female castes (workers and queens). Antenna with 4-12 segments in female castes, with 9-13 segments in males. Antenna geniculate between the long basal segment (scape) and the remaining funicular segments. Second abdominal segment reduced, forming a node or scale (the petiole), isolated from the alitrunk in front and the remaining abdominal segments behind. Frequently the third abdominal segment also reduced and isolated (posteptiole). Wings of alate queens deciduous, shed after mating. Metapleural gald generally present on alitrunk, opening above the metacoxa.