A myrmecophilous soft scale, Akermes colimae Cockerell is transferred to the new genus Aztecalecanium Kondo and Williams. The adult female and first-instar nymph are redescribed and described respectively. Diagnostic morphological characters of the species are given. This is the first time the insect has been illustrated. Key Words: Akermes colimae, Azteca longiceps, coccid, Mexico.