Key to US Atta species

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Key to Atta species of the United States based on workers.

  • Posterior cephalic lobes and first gastral tergite lacking erect hairs, the surface shiny; concavity between cephalic lobes relatively shallow, the angle between its sides more than 90 degrees; pronotal spines relatively short => Atta mexicana
Head of Atta mexicana worker
Profile of Atta mexicana worker
  • Posterior cephalic lobes and first gastral tergite with hairs, the surface matte; concavity between cephalic lobes relatively deep, the angle between its sides less than 90 degrees; pronotal spines relatively long => Atta texana
Head of Atta texana worker
Profile of Atta texana worker