Nylander, W. 1846b. Additamentum adnotationum in monographiam formicarum borealium Europae. Acta Societatis Scientiarum Fennicae 2:1041-1062. PDF
Nylander, W. 1849 ("1848"). Additamentum alterum adnotationum in monographiam formicarum borealium. Acta Societatis Scientiarum Fennicae 3:25-48. PDF
Nylander, W. 1851. Remarks on "Hymenopterologische Studien by Arnold Foerster, 1stes Heft, Formicariae, Aachen, 1850". Annals and Magazine of Natural History (2)8:126-129.
Nylander, W. 1856a. [Untitled. Introduced by: "M. L. Fairmaire communique la note suivante, de M. Nylander, et la Société en décide l'impression dans le Bulletin."]. Annales de la Société Entomologique de France (Bull.) (3)4:xxviii.
Nylander, W. 1856b. Synopsis des Formicides de France et d'Algérie. Annales des Sciences Naturelles, Zoologie (4)5:51-109. PDF
Nylander, W. 1857 ("1856"). [Untitled. Introduced by: "M. L. Fairmaire communique la note suivant de M. Nylander sur les Formicides du Mont-Dore, et la Société en décide l'impression dans le Bulletin."]. Annales de la Société Entomologique de France (Bull.) (3)4:lxxviii-lxxix.
O'Connor, J. P. 2000. A second Irish locality for Tetramorium lucayanum Wheeler (Hym., Formicidae). Entomologist's Monthly Magazine 136:86.
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
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
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
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.
O'Neill, K. M. 1997. Multi-species mating swarms of Formica in southwestern Montana, U.S.A. (Hymenoptera: Formicidae). Journal of Hymenoptera Research 6:336-343.
O'Rourke, F. J. 1940. Notes on the ant fauna of Howth, County Dublin. Irish Naturalist's Journal 7:30. PDF
O'Rourke, F. J. 1945. A further extension of the range of Myrmica schenki, Emery. Entomologist's Record and Journal of Variation 57:85-86. PDF
O'Rourke, F. J. 1946. The discovery of the rare ant, Stenamma westwoodi Westwood, in Co. Wicklow. Irish Naturalist's Journal 8:413-414. PDF
O'Rourke, F. J. 1950a. The distribution and general ecology of the Irish Formicidae. Proceedings of the Royal Irish Academy. Section B 52:383-410.
O'Rourke, F. J. 1950b. Myrmecological notes from Narvik, northern Norway. Norsk Entomologisk Tidsskrift 8:47-50. PDF
O'Rourke, F. J. 1952. A preliminary ecological classification of ant communities in Ireland. Entomologist's Gazette 3:69-72. PDF
O'Rourke, F. J. 1979. The social Hymenoptera of County Wexford. Proceedings of the Royal Irish Academy. Section B 79:1-14.
Oberski, J. 2022. First phylogenomic assessment of the amphitropical New World ant genus Dorymyrmex (Hymenoptera: Formicidae), a longstanding taxonomic puzzle. Insect Systematics and Diversity 6 (1): 8:1-10. 10.1093/isd/ixab022 PDF
Oberski, J. T. 2024. Ultraconserved element (UCE) phylogenomics illuminates the evolutionary history and biogeography of Dorymyrmex pyramid ants. Systematic Entomology -:1-24. [online early] 10.1111/syen.12658 PDF
Oberstadt, B.; Heinze, J. 2003. Mating biology and population structure of the ant, Leptothorax gredleri. Insectes Sociaux 50:340-345. PDF
Obin, M. S.; Vander Meer, R. K. 1989. Between and within-species recognition among imported fire ants and their hybrids (Hymenoptera: Formicidae): application to hybrid zone dynamics. Annals of the Entomological Society of America 82:649-652.
Ochi, K. 1983. Distribution pattern of ants in pine stands, with special reference to Monomorium nipponense Wheeler (Hymenoptera: Formicidae). [In Japanese.]. Gensei 44:1-6.
Oeser, R. 1961. Vergleichend-morphologische Untersuchungen über den Ovipositor der Hymenopteren. Mitteilungen aus dem Zoologischen Museum in Berlin 37:1-119.
Oettler, J.; Suefuji, M.; Heinze, J. 2010. The evolution of alternative reproductive tactics in male Cardiocondyla ants. Evolution 64:3310-3317. PDF
Ofer, J. 1970. Polyrhachis simplex. The weaver ant of Israel. Insectes Sociaux 17:49-82. PDF
Ofer, J.; Shulov, A.; Noy-Meir, I. 1978. Associations of ant species in Israel: a multivariate analysis. Israel Journal of Zoology 27:199-208. 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.
Ogata, K. 1982. Taxonomic study of the ant genus Pheidole Westwood of Japan, with a description of a new species (Hymenoptera, Formicidae). Kontyû 50:189-197. PDF