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 Rohwer S. A., 1922: Notes and descriptions of neotropical sawflies of the subfamily Perreyiinae. 7 pp. 

 Rohwer S. A., 1922: Notes on sawflies, with descriptions of new genera and species. 27 pp. 

 Rohwer S. A., 1922: Some notes on wasps of the subfamily Nyssoninae, with descriptions of new species. 11 pp. 

 Rohwer S. A., 1923: New Hymenoptera from the Malayan region. 9 pp. 

 Rohwer S. A., 1925: Sawflies from the Maritime Province of Siberia. 12 pp. 

 Rohwer S. A., 1927: Two European sawflies of the genus Emphytina found in the United States (Hym.). 2 pp. 

 Rohwer S. A., Fagan M. M., 1920: Additions and corrections to “The type species of the genera of the Cynipoidea or the gall wasps and parasitic cynipoids.” 4 pp.  

 Rohwer S. A., Fagan M., 1917: The type-species of the genera of the Cynipoidea, or the gall wasps parasitis Cynipoids. 24 pp. 

 Rohwer S. A., Fagan M., 1919: Additions and corrections to “the type-species of the genera of the Cynipoidea or the gall wasps and parasitic Cynipoids”. 4 pp. 

 Rohwer S. A., Middleton W., 1922: North American sawflies of the subfamily Cladiinae. Notes on habits and descriptions of larvae. 53 pp. 

 Roig-Alsina A., 1994: Meliphilopsis, a new genus of emphorine ees, and notes on the relationships among the genera of Emphorina (Insecta: Hymenoptera: Apoidea: Apidae). 8 pp. (in English). Reichenbachia 30(2): 181-188.

 Roig-Alsina A., 2003: A revision of the bee genus Tapinotaspis Holmberg (Hymenoptera: Apidae, Tapinotaspidini). 9 pp. Mitteilungen der münchner entomologischen Gesellschaft 93: 45-53.

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 Roller L., 1999: Check-list of the sawflies (Hymenoptera, Symphyta) of Slovakia. 12 pp. [M32] [51960] Entomological Problems 30(2): 37-48.

 Roman A., 1904: Sibirische ichneumonen im schwedischen Reichsmuseum. 13 pp. 

 Roman A., 1907: Ueber Tropistes rufipes Kriechb. und Hemiteles falcatus Thoms. (Hym.). 2 pp. 

 Roman A., 1923: Ichneumonids reared from Diptera Nematocera. 6 pp. 

 Roman A., 1923: Three new English ichneumonids. 4 pp. 

 Roman A., 1930: Oxford University Greenland Expedition, 1928. – Ichneumonidae collected by Major R. W. G. Hingston on the Oxford University Expedition to Greenland, 1928. 8 pp. 

 Roman A., 1932: The Linnean types of Ichneumon flies. 16 pp. 

 Roman A., 1936: Die Ichneumoniden des noerdlichen Norwegens. 25 pp. 

 Romand M., 1838: Description d’une nouvelle espéce de Paxyllomme. 3 pp. 

 Romasenko L. P., 1992: The prepupae of the genera Chalicodoma Lep. and Megachile Latr. (Hymenoptera, Apoidea, Megachilidae). 11 pp. (in Russian). Entomologitsheskoe obozrenie 71(3): 646-656.

 Romasenko L. P., Banaszak J., 2002: Notes on the specific status of Chalicodoma saussurei (Radoszkowski, 1874) (Hymenoptera: Apoidea: Megachilidae). 8 pp. [HYM4657] Genus 13(3): 397-404.

 Romasenko L., Banaszak J., Cierzniak T., 2005: Redescription of Andrena (Graecandrena) schwarzi Warncke, 1975 and A. (G.) walishanovi Osytshnjuk, 1994 (Hymenoptera: Apoidea: Andrenidae). 10 pp. [53793] Genus 16(1): 119-128.

 Rome Q., Muller F., Gargominy O., Villemant C., 2009: Bilan 2008 de l’invasion de Vespa velutina Lepeletier en France (Hymenoptera, Vespidae). 6 pp. (in French). Bulletin de la Société entomologique de France 114(3): 297-302.

 Ronquist F., 1995: Phylogeny and early evolution of the Cynipoidea (Hymenoptera). 27 pp. Systematic Entomology 20(4): 309-335.

 Roques A., Sun J.-H., Pan Y.-Z., Zhang X.-D., 1995: Contribution to the knowledge of seed chalcids, Megastigmus spp. (Hymenoptera: Torymidae), in China, with the description of three new species. 13 pp. Mitt. Schweiz. entomol. Ges. 68(1-2): 211-223.

 Rosa P., 2002: I crisidi (Hymenoptera, Chrysididae) della Valle d’Aosta. Check-list e note introduttive. 7 pp. (in French). Rev. valdotaine hist. nat. 56: 59-65.

 Rosa P., 2003: Cleptes (Leiocleptes) mareki n. sp., from China (Hymenoptera Chrysididae Cleptinae). 8 pp. (in English). Atti Soc. it. Sci. nat. Museo civ. Stor. nat. Milano 144(2): 407-414.

 Rosa P., 2003: I crisidi (Hymenoptera, Chrysididae) della Romagna. Stato attuale delle conoscenze. 12 pp. (in Italian). Ann. Mus. civ. St. nat. Ferrara 6: 29-40.

 Rosa P., 2004: Alcune osservazioni sulle relazioni tra Vegetazione e Crisidi (Hymenoptera, Chrysididae) in Italia. 12 pp. (in Italian). G. it. Ent. 11: 79-90.

 Rosa P., 2004: Chrysis schmideggeri n. sp., a new cuckoo-wasp of the Chrysis rubricata-group (Hymenoptera, Chrysididae). 13 pp.(in English). Atti Soc. it. Sci. nat. Museo civ. Stor. nat. Milano 145(2): 307-319.

 Rosa P., 2004: Gli Imenotteri Crisidi (Hymenoptera, Chrysididae) della collezione campadelli. 10 pp. (in Italian). Ann. Mus. civ. St. nat. Ferrara 7: 87-96.

 Rosa P., 2009: Catalogo dei tipi dei Crisidi del Museo civico di Storia naturale “G. Doria” di Genova (Hymenoptera, Chrysididae). 64 pp. (in Italian). Annali del Museo civico di Storia naturale Giacomo Doria 100: 209-272.

 Rosanov I. V., 1969: Pereopisanie Chartocerus musciformis Motschulsky (Hymenoptera, Signiphoridae), vyvedennogo iz mučnistogo červeca (Pseudococcidae) s kofeinogo dereva na Cejlone. 3 pp. 

 Rose A. H., Sippell W. L., 1966: Distribution of cocoon parasites of the European pine sawfly, Neodiprion sertifer (Geoffroy) in Southern Ontario. 6 pp. 

 Rose M., Rosen D., 1992: Eretmocerus debachi n. sp. (Hymenoptera: Aphelinidae), an effective parasite of Parabemisia myricae (Homoptera: Aleyrodidae). 9 pp. Israel Journal Ent. 26-27(1991-1992): 199-207.

 Rosen D., 1965: A new species of Clausenia Ishii (Hymenoptera: Encyrtidae) from Israel. 7 pp. 

 Rosen D., 1967: The hymenopterous parasites of soft scales on citrus in Israel. 29 pp. (in English). Beiträge zur Entomologie 17(1-2): 251-279.

 Rosenheim J. A., Grace J. K., 1987: Biology of a wood-nesting wasp, Mimumesa mixta (W. Fox) (Hymenoptera: Sphecidae), and its parasite, Elampus viridicyaneus Norton (Hymenoptera: Chrysididae). 5 pp. Proc. Entomol. Soc. Wash. 89(2): 351-355.

 Rosenheim J. A., Hoy M. A., 1988: Genetic improvement of a parasitoid biological control agent: Artificial selection for insecticide resistance in Aphytis melinus (Hymenoptera: Aphelinidae). 12 pp. 

 Ross J., 1946: Cynipid flies and galls on Oak. 16 pp. 

 Ross J., 1951: A study of some British species of Synergus (Hymenoptera, Cynipoidea). 16 pp. 

 Rossem G. van, 1983: A revision of Western Palaearctic Oxitorine genera. Part IV. Genus Megastylus (Hymenoptera, Ichneumonidae). 12 pp. [M20] Entomofauna 4/8: 121-132.

 Rossem G., 1989: Supplementary notes on the genus Trychosis. Mitteilungen der münchner entomologischen Gesellschaft 79: 101-110.

 Rössler Y., DeBach P., 1972: The biosytematic relations between a thelytokous and an arrhenotokous form of Aphytis mytilaspidis (le Baron) (Hymenoptera: Aphelinidae). 2. Comparative biological and morphological studies. 11 pp. 

 Rossum A. J., 1871: Sur le liquide des larves de Cimbex. 4 pp. 

 Rothney G. A. J., 1903: The Aculeate Hymenoptera of Barrackpore, Bengal. 22 pp.