O'Keefe, S. T.; Cook, J. L.; Dudek, T.; Wunneburger, D. F.; Guzman, M. D.; Coulson, R. N.; Vinson, S. B. 2000. The distribution of Texas ants. Southwestern Entomologist Supplement 22:1-92.

Ohl, M. 2004. The first fossil representative of the wasp genus Dolichurus, with a review of fossil Ampulicidae (Hymenoptera: Apoidea). Journal of the Kansas Entomological Society 77:332-342. PDF

Ohnishi, H.; Imai, H. T.; Yamamoto, M.-T. 2004 ("2003"). Molecular phylogenetic analysis of ant subfamily relationship inferred from rDNA sequences. Genes and Genetic Systems 78:419-425. PDF

O'Keefe, S. T.; Agosti, D. 1998 ("1997"). A new species of Probolomyrmex (Hymenoptera: Formicidae) from Guanacaste, Costa Rica. Journal of the New York Entomological Society 105:190-192. PDF

Ogata, K.; Onoyama, K.; Terayama, M.; Ugawa, Y.; Kihara, A.; Tsukii, Y.; Kondo, K.; Kubota, M.; Imai, H. T.; Taylor, R. W. 1998. Japanese ant color image database (1): an impact on taxonomic information. [Abstract.]. P. 350 in: Schwarz, M. P.; Hogendoorn, K. (eds.) 1998. Social insects at the turn of the millennium. Proceedings of the XIII International Congress of IUSSI. Adelaide, Australia. 29 December 1998 - 3 January 1999. Adelaide: XIII Congress of IUSSI, 535 pp.

Ogata, K.; Okido, H. 2007. Revision of the ant genus Perissomyrmex with notes on the phylogeny of the tribe Myrmecinini. Pp. 352-369 in: Snelling, R. R.; Fisher, B. L.; Ward, P. S. (eds.) 2007. Advances in ant systematics (Hymenoptera: Formicidae): homage to E.O. Wilson – 50 years of contributions. Memoirs of the American Entomological Institute 80:690 pp. PDF

Ogata, K.; Onoyama, K. 1998. A revision of the ant genus Smithistruma Brown of Japan, with descriptions of four new species (Hymenoptera: Formicidae). Entomological Science 1:277-287.

Ogata, K.; Okido, H. 2002. Taxonomy of the tribe Myrmecinini with special reference to the enigmatic genus Perissomyrmex. [Abstract.]. P. 157 in: Billen, J. P. J. 2002. XIV International Congress of IUSSI. The Golden Jubilee Proceedings. 27 July - 3 August 2002, Hokkaido University, Sapporo, Japan. Sapporo: XIV International Congress of IUSSI, 233 pp.

Ogata, K.; Murai, K.; Yamauchi, K.; Tsuji, K. 1996. Size differentiation of copulatory organs between winged and wingless reproductives in the ant Technomyrmex albipes. Naturwissenschaften 83:331-333.

O'Donnell, S.; Kaspari, M.; Lattke, J. 2005. Extraordinary predation by the Neotorpical army ant Cheliomyrmex andicola: implications for the evolution of the army ant syndrome. Biotropica 37:706-709. PDF

Ofer, Y.; Harris, Y.; Beiles, A.; Nevo, E. 1996. Biodiversity of ants at "Evolution Canyon", Nahal Oren, Mt. Carmel, Israel. Israel Journal of Zoology 30:115-119.

O'Donnell, S.; Lattke, J.; Powell, S.; Kaspari, M. 2007. Army ants in four forests: geographic variation in raid rates and species composition. Journal of Animal Ecology 76:580-589. PDF

Oberstadt, B.; Heinze, J. 2003. Mating biology and population structure of the ant, Leptothorax gredleri. Insectes Sociaux 50:340-345. PDF

O'Connor, J. P. 2000. A second Irish locality for Tetramorium lucayanum Wheeler (Hym., Formicidae). Entomologist's Monthly Magazine 136:86.

Noyce, K. V.; Kannowski, P. B.; Riggs, M. R. 1997. Black bears as ant-eaters: seasonal associations between bear myrmecophagy and ant ecology in north-central Minnesota. Canadian Journal of Zoology 75:1671-1686.

Nunes, P. H.; Camargo-Mathias, M. I. 2005. Study of the venom glands in Ectatomma quadridens (Hymenoptera: Formicidae). Evolutionary hypothesis in subfamily Ponerinae. Sociobiology 45:949-966. PDF

Noon-Anant, N.; Kohout, R.; Watanasit, S.; Yamane, S.; Wiwatwitaya, D. 2009. Additional records of Polyrhachis (Myrmatopa) varicolor Viehmeyer (Formicidae: Formicinae) from Southern Thailand, with notes on Its nesting habits. The Natural History Journal of Chulalongkorn University 9 (2):171-188. PDF

Niemelä, J.; Haila, Y.; Punttila, P. 1996. The importance of small-scale heterogeneity in boreal forests: variation in diversity in forest-floor invertebrates across the succession gradient. Ecography 19:352-368.

Nipperess, D. A.; Andersen, A. N.; Pik, A. J.; Bramble, R.; Wilson, P.; Beattie, A. J. 2008. The influence of spatial scale on the congruence of classifications circumscribing morphological units of biodiversity. Diversity and Distributions 14:917-924. PDF

Niculita, H.; Julien, J.-F.; Petrochilo, E. 1998. Molecular characterization of the abdominal-A locus in Formicidae. [Abstract.]. P. 345 in: Schwarz, M. P.; Hogendoorn, K. (eds.) 1998. Social insects at the turn of the millennium. Proceedings of the XIII International Congress of IUSSI. Adelaide, Australia. 29 December 1998 - 3 January 1999. Adelaide: XIII Congress of IUSSI, 535 pp.

Nielsen, M. G. 1997. Nesting biology of the mangrove mud-nesting ants Polyrhachis sokolova Forel (Hymenoptera, Formicidae) in northern Australia. Insectes Sociaux 44:15-21.

Nielsen, M. G. 2000. Distribution of the ant (Hymenoptera: Formicidae) fauna in the canopy of the mangrove tree Sonneratia alba J. Smith in northern Australia. Australian Journal of Entomology 39:275-279. PDF

Neumeyer, R.; Seifert, B. 2005. Kommentierte Liste der frei lebenden Ameisen (Hymenoptera: Formicidae) in der Schweiz. Mitteilungen der Schweizerischen Entomologischen Gesellschaft 78:1-17. PDF

Niculita, H.; Julien, J. F.; Petrochilo, E. 2001. A molecular study of Abdominal-A in the ant Myrmica rubra reveals lineage dependent evolutionary rates for a developmental gene. Insect Molecular Biology 10:513-521.

Neumeyer, R.; Giacalone, I.; Moretti, M. 2000. Syntopie dreier Arten der Gattung Stenamma Westwood 1840 (Hymenoptera: Formicidae) im Tessin (Schweiz). Mitteilungen der Schweizerischen Entomologischen Gesellschaft 73:1-4. PDF

Nel, A.; Perrault, G. 2004. [Untitled. Genus Gerontoformica Nel and Perrault n. gen. Type species: Gerontoformica cretacica Nel and Perrault n. sp.]. Pp. 24-26 in: Nel, A.; Perrault, G.; Perrichot, V.; Néraudeau, D. 2004. The oldest ant in the Lower Cretaceous amber of Charente-Maritime (SW France) (Insecta: Hymenoptera: Formicidae). Geologica Acta 2:23-29. PDF

Netshilaphala, N. M.; Milton, S. J.; Robertson, H. G. 2005. Response of an ant assemblage to mining on the arid Namaqualand coast, South Africa. African Entomology 13:162-167.

Nel, A.; Perrault, G.; Perrichot, V.; Néraudeau, D. 2004. The oldest ant in the Lower Cretaceous amber of Charente-Maritime (SW France) (Insecta: Hymenoptera: Formicidae). Geologica Acta 2:23-29. PDF

Nash, M. S.; Bradford, D. F.; Franson, S. E.; Neale, A. C.; Whitford, W. G.; Heggem, D. T. 2004. Livestock grazing effects on ant communities in the eastern Mojave Desert, USA. Ecological Indicators 4:199-213.

Naumann, K.; Preston, W. B.; Ayre, G. L. 1999. An annotated checklist of the ants (Hymenoptera: Formicidae) of British Columbia. Journal of the Entomological Society of British Columbia 96:29-68.