Crematogaster atra

Longino, J. T., 2003, The Crematogaster (Hymenoptera, Formicidae, Myrmicinae) of Costa Rica., Zootaxa (151), pp. 1-150 : 129

The syntypes of atra have no more precise locality data than "Mexico," but are by two different collectors, Bilimek and Norton. The Norton series, from which the lectotype is chosen, has the general shape and pilosity characters of crinosa , the only difference being that the face is completely covered with fine, dense striae, with no smooth or shiny areas.