Biologia Centrali-Americana; or, contributions to the knowledge of the fauna and flora of Mexico and Central America. Insecta. Hymenoptera. 3 (Formicidae). Author Forel, A. text 1899 Unknown Publisher London http://antbase.org/ants/publications/8170/8170.pdf book 8170 6. Azteca nigella . Azteca nigella, Emery , Mem. Accad. Sci. Bologna, (5) iii. p. 132 (1893) l. Hab. Bresil 1.