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 Rawlings G. B., 1957: Guiglia schauinslandi (Ashmead) (Hym. Orussidae) a parasite of Sirex noctilio (Fabricius) in New Zealand. 2 pp. [M43] 

 Raymond M. G., 1882: Observations sur l’organisation et les moeurs du Nematus ribesii Scopoli. 26 pp. 

 Rebélo J. M. M., Moure J. S., 1995: As espécies de Euglossa Latreille do nordeste de Sao Paulo (Apidae, Euglossinae). 12 pp. Revta bras. Zool. 12(3): 445-466.

 Reichensperger A., 1926: Das von Eciton mattogrossensis Luederw. (Hym). 4 pp. 

 Reinhard H., 1884: Zwei seltene Giraud‘sche Hymenopterengattungen. 4 pp. [M44] 

 Reinig W. F., 1968: Über die Hummeln und Schmarotzerhummeln Nordwest-Anatoliens (Hym., Apidae). 12 pp. [HYM 3223] Nachrichtenblatt der Bayerischen Entomologen 17(6): 101-112.

 Reinig W. F., 1981: Synopsis der in Europa nachgewiesenen Hummel- und Schmarotzerhummelarten (Hymenoptera, Bombidae). 6 pp. [HYM5872] Spixiana 4(2): 159-164.

 Reinig W., F., 1969: Bastardierungszonen und Mischpopulationen bei Hummeln (Bombus) und Schmarotzerhummeln (Psithyrus) (Hymenopt., Apidae). 89 pp. [M32] Mitteilungen der münchner entomologischen Gesellschaft 59: 1-89.

 Rezek V., 1947: Hostitelé Torymid (Hym., Chalc.) na moravském Slovácku I. 1 pp. [HYM 3230] Folia entomologica 10: 111.

 Rezek V., 1949: Hostitelé Torymid (Hym., Chalc.) na moravském Slovácku II. 2 pp. [HYM 3231] Folia entomologica 12: 47-48.

 Ribbands C. R., 1950: Changes in the behaviour of honey-bees following their recovery from Anaesthesia. 9 pp. 

 Ribbands C. R., 1951: The flight range of the honey-bee. 7 pp. 

 Richards O. W., 1947: On a new species of Mesodryinus (Hym., Dryinidae) bred by Dr. E. McC. Callan in Trinidad. 4 pp. [M43] 

 Richards O. W., 1956: The nests of South American social wasps. 2 pp. [M43] 

 Richards O. W., 1962: The nest of Ancistrocerus Waldenii flavidulus Bequaert in California (Hymenoptera: Vespidae). 2 pp. [M43] 

 Richards O. W., 1967: Some British species of Leiophron Nees (Hymenoptera: Braconidae, Euphorinae), with the description of two new species. 16 pp. The Transactions of the Royal Entomological Society of London 119(5)

 Richards O. W., 1968: New records and new species of Australian Masaridae (Hymenoptera: Vespoidea). 4 pp. 

 Richards O. W., 1969: Cyrtogonatopus Kiefffer (Hymenoptera: Dryinidae), with the description of a new species from Cuba. 3 pp. 

 Richards O. W., 1969: Records of Masarid wasps with descriptions of two new species of Quartinia Ed. André (Hymenoptera). 5 pp. [M43] 

 Richards O. W., 1969: Species of Trypoxylon Latreille (Hymenoptera: Sphecidae) from Cuba. 4 pp. [M43] 

 Richards O. W., 1970: Three new species of Polybia Lepeletier (Hymenoptera, Vespidae, Polistinae). 5 pp. [M43] 

 Richards O. W., 1971: A new British species of Dryinidae (Hymenoptera). 1 pp. [M43] 

 Richards O. W., 1971: The habits of Editha magnifica (Perty) (Hym. Sphecidae, Bembicini). 2 pp. [M43] 

 Richards O. W., 1971: Two new species of the genus Microstigmus Ducke (Hymenoptera: Sphecoidea). 3 pp. 

 Richards O. W., 1973: Rhopalidia Lepeletier, 1836 (Hymenopteraaaaa: Vespidae): proposed suppression undr the plenary powers. Z. N. (S.) 2017. 2 pp. [M43] 

 Richards O. W., 1974: The cretan hornet. 2 pp. 

 Richards O. W., 1975: A new British species of Bethylidae (Hym.). 2 pp. [M43] 

 Richards O. W., 1981: A new species of Quartinioides Richards (Hymenoptera, Masaridae). 2 pp. [M43] 

 Riedel M., 2004: Eine neue Art der Gattung Anisobas Wesmael, 1844 [1845] aus Norwegen (Hymenoptera, Ichneumonidae, Ichneumoninae, Listrodromini). 4 pp. [M23] Entomofauna 25(6): 93-96.

 Riedel M., 2007: 2. Beitrag zur Faunistik der deutschen Ichneumoniden (Hymenoptera: Ichneumonidae). 3 pp. (in German). Nachrichtenblatt der Bayerischen Entomologen 56(3-4): 109-111.

 Riedel M., Wall I., 2010: Cosmophorus regius un Streblocera antennata neu für Deutschland (Hymenoptera: Braconidae). 2 pp. Nachrichtenblatt der Bayerischen Entomologen 59(1-2): 39-40.

 Rimskij- Korsakov M. N., 1933: Methoden zur Untersuchung von Wasserhymenopteren. 32 pp. 

 Ritter G., 1866: Weiter Mittheilung über die Rapswespe. 6 pp. 

 Rohwer S. A., 1913: New parasitic Hymenoptera Belonging to the tribe Xoridini. 9 pp. 

 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., 1925: Sawflies from the Maritime Province of Siberia. 12 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., 2003: A revision of the bee genus Tapinotaspis Holmberg (Hymenoptera: Apidae, Tapinotaspidini). 9 pp. Mitteilungen der münchner entomologischen Gesellschaft 93: 45-53.

 Roller L., 1999: Check-list of the sawflies (Hymenoptera, Symphyta) of Slovakia. 12 pp. [EPR 302037] [M32] 

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

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

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

 Roubaud E., 1910: Recherches sur la Biologie des Synagris (Hymén.). 25 pp. [M59] 

 Rühl F., 1889: In infallibilitatem. 2 pp. [M43] 

 Ruhnke H., 2000: Zur Nestbiologie der Megachile genalis Mor. (Hymenoptera: Apidae). 4 pp. (in German). Mitt. Dtsch. Ges. Allg. Angew. Ent. 12: 513-516.