1. Azteca instabilis ^HNS.

Tapinoma instabilis, Smith ^HNS, Trans. Eut. Soc. Lond. (3) i. p. 31 ([[worker]]) (1862) 1.

Liometopum instabile, Mayr ^HNS, Verh. zool. - bot. Ges. Wien, xxvii, p. 870 2. Azteca instabilis, Dalla Torre ^HNS, Cat. Hymen. vii. p. 164 3.? Iridomyrmex xanthochrous, Mayr ^HNS, Sitzungsber. Akad. Wiss. Wien, liii. p. 497 ([[worker]]) 4 (nec Roger). Azteca instabilis (Smith), var. xanthochroa, Emery ^HNS, Mem. Accad. Sci. Bologna, (5) iii. p. 137 ([[worker]]) (1893) 5.

Hab. Mexique 3 5, Teapa en Tabasco (H. H. Smith); Guatemala (Stoll); Costa Rica (Alfaro).