Rosengren, R.; Cherix, D.; Poutanen, R. 1981. The pupa-carrying test as a taxonomic tool in the Formica rufa group. Memoranda Societatis pro Fauna et Flora Fennica 57:14.

Rosengren, R.; Pamilo, P. 1983. The evolution of polygyny and polydomy in mound-building Formica ants. Acta Entomologica Fennica 42:65-77.

Rosengren, R.; Pamilo, P. 1984. The interrelationship between mating behaviour, sex ratio and queen number in Formica. [Abstract.]. P. 517 in: XVII International Congress of Entomology 1984. Abstract Volume. Hamburg, Federal Republic of Germany, August 20-26, 1984. Hamburg: XVII International Congress of Entomology, 960 pp.

Rosengren, R.; Vepsäläinen, K.; Wuorenrinne, H. 1979. Distribution, nest densities and ecological significance of wood ants (the Formica rufa group) in Finland. Bulletin SROP [Section Regional Ouest Paléarctique, Organisation Internationale de Lutte Biologique] 1979(II-3):181-213.

Rosengren, R.; Vepsäläinen, K.; Wuorenrinne, H. 1981. Distribuzione, densità delle colonie ed importanza ecologica delle formiche del gruppo Formica rufa in Finlandia. Collana Verde 59:237-259.

Ross, E. S. 1954. [Review of: Cook, T. W. 1953. The ants of California. Palo Alto: Pacific Books, 462 pp.]. Pan-Pacific Entomologist 30:14.

Ross, H. H.; Rotramel, G. L.; La Berge, W. E. 1971. A synopsis of common and economic Illinois ants, with keys to the genera (Hymenoptera, Formicidae). Illinois Natural History Survey. Biological Notes 71:1-22.

Ross, K. G. 1992. Strong selection on a gene that influences reproductive competition in a social insect. Nature (London) 355:347-349.

Ross, K. G.; Carpenter, J. M. 1991. Phylogenetic analysis and the evolution of queen number in eusocial Hymenoptera. Journal of Evolutionary Biology 4:117-130.

Ross, K. G.; Fletcher, D. J. C. 1985a. Genetic origin of male diploidy in the fire ant, Solenopsis invicta (Hymenoptera: Formicidae), and its evolutionary significance. Evolution 39:888-903.

Ross, K. G.; Fletcher, D. J. C. 1985b. Comparative study of genetic and social structure in two forms of the fire ant Solenopsis invicta (Hymenoptera: Formicidae). Behavioral Ecology and Sociobiology 17:349-356.

Riemann, H. 1988. Beitrag zur Stechimmenfauna niedersächsischer Sandgruben (Hymenoptera: Aculeata). Braunschweiger Naturkundliche Schriften 3:213-242.

Riemann, H. 1995. Zur Stechimmenfauna des Bremer Bürgerparks (Hymenoptera: Aculeata). Abhandlungen herausgegeben vom Naturwissenschaftlichen Verein zu Bremen 43:45-72.

Riemann, H. 1987a. Bienen, Wespen und Ameisen (Hymenoptera Aculeata) als Besiedler von Böschungen an tiefliegenden Entwässerungsgräben. Abhandlungen herausgegeben vom Naturwissenschaftlichen Verein zu Bremen 40:333-346.

Riemann, H. 1987b. Die Bienen, Wespen und Ameisen (Hymenoptera Aculeata) der Naturschutzgebiete "Dünengebiet bei Neumühlen" und "Vossberge" unter Berücksichtigung weiterer Binnendünenareale. Beihefte zur Schriftenreihe Naturschutz und Landschaftspflege in Niedersachsen 17:1-79.

Rigato, F.; Sciaky, R. 1989. Contributo alla conoscenza della mirmecofauna della Val Gesso (Alpi Marittime) (Hymenoptera Formicidae). Bollettino del Museo Regionale di Scienze Naturali. Torino 7:427-442.

Rigato, F.; Sciaky, R. 1991. The myrmecofauna of the Gesso Valley (Maritime Alps) (Hymenoptera Formicidae). Ethology Ecology and Evolution Special Issue 1:87-89.

Rissing, S. W.; Pollock, G. B. 1988. Pleometrosis and polygyny in ants. Pp. 179-222 in: Jeanne, R. L. (ed.) 1988. Interindividual behavioral variability in social insects. Boulder: Westview Press, ix + 456 pp.

Rissing, S. W.; Pollock, G. B. 1989. Behavioral ecology and community organization of desert seed-harvesting ants. Journal of Arid Environments 17:167-173.

Ritter, H. 1953. Nachweis von Anergates atratulus Schenk. [sic] (Hym., Form.) in Österreich. Entomologisches Nachrichtenblatt Österreichischer und Schweizer Entomologen 5:50.

Rittler, H. 1954. Zur Ameisenfauna von Niederösterreich. Unsere Heimat 25:170-171.

Robbins, W. W. 1910. An introduction to the study of the ants of northern Colorado. University of Colorado Studies 7:215-222. PDF

Robertson, H. G. 1995. Sperm transfer in the ant Carebara vidua F. Smith (Hymenoptera: Formicidae). Insectes Sociaux 42:411-418.

Robertson, H. G.; Villet, M. H. 1989b. Mating behavior in three species of myrmicine ants (Hymenoptera: Formicidae). Journal of Natural History 23:767-773.

Robertson, P. L. 1968. A morphological and functional study of the venom apparatus in representatives of some major groups of Hymenoptera. Australian Journal of Zoology 16:133-166. PDF

Rockwood, L. L. 1973. Distribution, density and dispersion of two species of Atta (Hymenoptera: Formicidae) in Guanacaste Province, Costa Rica. Journal of Animal Ecology 42:803-817.

Rodríguez Garza, J. A.; Prado Beltrán, E.; Equihua Martínez, A. 1989. Claves para subfamilias y géneros de hormigas (Hymenoptera: Formicidae) de Nuevo León. Agrociencia 76:257-268.

Rögener, J.; Pfau, J. 1994. Untersuchungen zur Ameisenfauna (Hym., Formicidae) eines Kalkmagerrasen-Gehölz-Komplexes des Halbesberges bei Witzenhausen (Werra-Meissner-Kreis). Braunschweiger Naturkundliche Schriften 4:553-574.

Rohe, W. 1990. Wiederfund von Formicoxenus nitidulus (Nylander 1846) in Rheinland-Pfalz (Hymenoptera: Formicidae). Mainzer Naturwissenschaftliches Archiv 28:137-142.

Rohe, W.; Heller, G. 1990a. Vorläufige Ameisenliste (Formiciden) mit Kurzkommentar für Rheinhessen, die Pfalz und den Naheraum. Fauna und Flora in Rheinland-Pfalz 5(4):803-818.

Notes: Not seen. Cited in Rohe & Heller (1990b).