Eciton (Acamatus) melanocephalum Emery Eciton (Neivamyrmex) melanocephalum Neivamyrmex melanocephalus Eciton (Acamatus) melanocephalum subsp. xipe Wheeler New synonymy, new species, new keys to Neivamyrmex army ants of the United States. Snelling, G. C. Snelling, R. R. Memoirs of the American Entomological Institute 2007 Advances in ant systematics (Hymenoptera: Formicidae): Homage to E. O. Wilson - 50 years of contributions. 80 459 550 4658Z urn:lsid:biosci.ohio-state.edu:osuc_concepts:32836 Insecta Formicidae Neivamyrmex CoL Animalia Neivamyrmex melanocephalus (Emery) Hymenoptera 478 Arthropoda species melanocephalus  Figures 28, 80   Eciton (Acamatus) melanocephalum Emery, 1895: 260 (w).     MEXICO, Tepic(  MHNG).  Eciton (Neivamyrmex) melanocephalum: M. R. Smith, 1942: 549 (w) (part). Creighton, 1950: 72 (part).  Neivamyrmex melanocephalus: Borgmeier, 1953: 19. Borgmeier, 1955: 385 - 387 (w).  Eciton (Acamatus) melanocephalum subsp. xipe Wheeler, 1914: 41; worker. MEXICO, Hidalgo, San Miguel (MCZC).  DISTRIBUTION (Map 7) UNITED STATES: Arizona; MEXICO: south at least to Oaxaca and Morelos. SPECIMENS EXAMINED   UNITED STATES, ARIZONA: Santa Cruz Co.: Upper White Rock Campground, Pena Blanca Lake( 31.39 ° N 111.08 ° W), 1200 m ( GCSC, LACM);  Nogales, on sidewalk ( USNM).   MEXICO, OAXACA: 14.5 km S Ocotlan, 1500 m( GCSC, WPMC).  MORELOS: La Luz Tetecala( WPMC).  DISCUSSION This rather large distinctive species is only rarely encountered in the United States and its principal range lies in Mexico and Guatemala. As discussed above, we believe that N. mandibularisis the likely male of N. melanocephalus, but it is also possible that N. mandibulariscould be the opposite sex of N. graciellae. One foraging raid of N. melanocephaluswas observed. It occurred in full daylight and the workers were taking a variety of small arthropods (B. V. Brown, pers. comm). 923900080 MHNG MEXICO Tepic 923900063 GCSC, LACM United States Santa Cruz Co. 31.39 Upper White Rock Campground -111.08 Santa Cruz Co. ARIZONA 923900072 USNM UNITED STATES Nogales Santa Cruz Co. ARIZONA 923900065 GCSC, WPMC Mexico 1500 m Ocotlan OAXACA 923900077 WPMC MEXICO La Luz Tetecala MORELOS