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Rachinsky, A. & K. Hartfelder, 1990. Corpora allata activity; a prime regulating element for caste-specific juvenile hormone titer in honey bee larvae (Apis mellifera carnica). Journal of Insect Physiology 36(3): 189-194.

Rachinsky, A. & K. Hartfelder, 1998. In vitro biosynthesis of juvenile hormone in larval honey bees: comparison of six media. In Vitro Cellular and Developmental Biology, Animal 34(8): 646-648.

Rachinsky, A. & M. F. Feldlaufer, 2000. Responsiveness of honey bee (Apis mellifera L.) corpora allata to allatoregulatory peptides from four insect species. Journal of Insect Physiology 46(1): 41-46.

Rachinsky, A., C. Strambi, A. Strambi & K. Hartfelder, 1990. Caste and metamorphosis: Haemolymph titers of juveline hormone and ecdysteroids in last instar honey bee. General and Comparative Endocrinology 79(1): 31-38.

Rachinsky, A., S. S. Tobe & M. F. Feldlaufer, 2000. Terminal steps in JH biosynthesis in the honey bee (Apis mellifera L.): developmental changes in sensitivity to JH precursor and allatotropin. Insect Biochemistry and Molecular Biology 30(8/9): 729-737.

Rack, G. & G. C. Eickwort, 1980. Biology and description of a new pygmephorid mite (Acarina: Tarsonemida) associated with the soil-nesting bee Agapostemon nasutus (Hymenoptera: Halictidae). Acarologia 21(2): 267-278.

Racys, J. 2000. Suitability of various hive types for Lithuania. Zemdirbyste, Mokslo Darbai No. 72: 268-280.

Racys, J. 2001. Heat losses from the nest of wintering bees through external constructions of a beehive. Zemdirbyste, Mokslo Darbai 76: 154-163.

Rada, V. & J. Petr, 2002. Enumeration of bifidobacteria in animal intestinal samples. Veterinarni Medicina 47(1): 1-4.

Radajewska, B. & L. Andrzejewska, 2001. The effect of flower pollination by a honeybee (Apis mellifera L.) on fruit set and size of peach and nectarine fruit. Folia Horticulturae 13(2): 129-135.

Radchenko, R. 1966. Role of honeybees as pollinators in increasing the seed crop from cabbage and radish. Bdzhilnitstvo 2: 72-75.

Radchenko, V. G. 1978. A new type of nest without cells in Metallinella atrocaerulea. Entomologicheskoe Obozrenie 57(3): 515-519. [In Russian; English translation in Entomological Review 57: 353-355.]

Radchenko, V. G. 1979. Nesting of Nomioides minutissimus (Rossi). Entomologicheskoe Obozrenie 58: 762-765. [In Russian; English translation in Entomological Review 58(4): 71-74.]

Radchenko, V. G. 1981. Nesting of four species of bees of the genus Andrena. Entomologicheskoe Obozrenie 60(4): 766-774. [In Russian.]

Radchenko, V. G. 1987. Nesting of Dasypoda braccata Eversmann (Hymenoptera, Melittidae) in the wouthwestern Ukraine. Entomologicheskoe Obozrenie 67: 299-301. [In Russian; English translation in Entomological Review 67: 57-60.]

Radchenko, V. G. 1993. The Eusocial Colony of the Halictine bees. Academiya Nauk Ukrania, Institut Zoologii, Kiev. 1-60 pp. [In Ukrainian.]

Radchenko, V. G. 1995. Evolution of nest building in bees. Entomologicheskoe Obozrenie 74: 342-354. [In Russian; English translation in Entomological Review 75(4): 20-32, 1996.]

Radchenko, V. G. & Yu. A. Pesenko, 1989. A key to the bees of the genus Dasypoda Latreille (Hymenoptera, Melittidae) of the European part of the USSR. Trudy Zoologicheskova Instituta, Akademii Nauk SSSR 188: 114-121. [In Russian.]

Radchenko, V. G. & Yu. A. Pesenko, 1994a. Biology of bees (Hymenoptera, Apoidea). Russian Academy of Sciences, Zoological Institute, St. Petersburg. 350 pp. [In Russian, English Summary, pp.314-331.]

Radchenko, V. G. & Yu. A. Pesenko, 1994b. Protobee and its nests: A new hypothesis concerning the early evolution of Apoidea. Entomologicheskoe Obozrenie 73: 913-933. [In Russian; English translation in Entomological Review 75: 140-162, 1996.]

Rademacher, E. 2000a. Ameisensäure im Applikator zugelassen zur Bekämpfung der Varroatose. Deutsches Bienenjournal 8: 6.

Rademacher, E. 2000b. Ameisensäure-Applikatoren zur Varroatosebekämpfung endlich zugelassen. Adiz/Die Biene/Imkerfreund 8: 17.

Rademacher, E. 2000c. Varroatosebekämpfung mit Ameisensäure im Applikator. Deutsches Bienenjournal 9: 10-11.

Rademacher, E. 2000d. Wer ist wofür zuständig? Bienenforschung in Berlin. Deutsches Bienenjournal 8: 31.

Rademacher, E. 2001a. Mitautorin: Varroa unter Kontrolle. 2001. Bericht ausgegeben von der Arbeitsgemeinschaft der Institute für Bienenforschung.

Rademacher, E. 2001b. Das Zulassungsverfahren für Milchsäure als Varroatose-Bekämpfungs­mittel. Deutsches Bienenjournal 12: 12.

Rademacher, E. 2001c. Milchsäure als Varroatose-Bekämpfungsmittel. Adiz/Die Biene/Imkerfreund 12: p.?

Rademacher, E., D. Brückner, C. Otten & J. Radtke, 2000. El Ácido fórmico en el tratamiento contra la varroasis. Vida Apícola 101: 41-47.

Rademacher, E. & M. Harz, 2006. Oxalic acid for the control of varroosis in honey bee colonies - a review. Apidologie 37(1): 98-120.

Rademacher, E. & J. Radtke, 2001. Investigations on the use of Thymovar against varroatosis. Apidologie 32: 488-489.

Rademaker, M. C. J., T. J. de, Jong & E. van der Meijden, 1999. Selfing rates in natural populations of Echium vulgare: a combined empirical and model approach. Functional Ecology 13(6): 828-837.

Radloff, P. 1987. Africanized honey bee and mite symposium. American Bee Journal 127(6): 422-423.

Radloff, S. E., H. R. Hepburn, 1997a. Multivariate analysis of honeybees, Apis mellifera, of the Horn of Africa. African Entomology 5: 57-64.

Radloff, S. E., H. R. Hepburn, 1997b. Multivariate analysis of honeybee populations (Apis mellifera L.) from west central Africa: morphometrics and pheromones. African Entomology 5: 195-204.

Radloff, S. E. & H. R. Hepburn, 1998. The matter of sampling distance and confidence levels in the subspecific classification of honeybees, Apis mellifera L. Apidologie 29: 491-501.

Radloff, S. E. & H. R. Hepburn, 1999a. Honeybees Apis mellifera Linnaeus (Hymenoptera : Apidae) of the Drakensberg mountains in relation to neighbouring populations. African Entomology 7: 35-41.

Radloff, S. E. & H. R. Hepburn, 1999b. Honeybees Apis mellifera Linnaeus (Hymenoptera : Apidae) of equatorial Africa. African Entomology 7: 265-269.

Radloff, S. E. & H. R. Hepburn, 2000. Population structure and morphometric variance in the Apis mellifera scutellata group of honeybees in Africa. Genetics and Molecular Biology 23: 305-316.

Radloff, S. E. & H. R. Hepburn, 2001. Population structure of Apis mellifera scutellata Lepeletier (Hymenoptera: Apidae): Filling the Uganda gap. African Entomology [In press].

Radloff, S. E. & H. R. Hepburn, 2002. Morphometric analysis of the populations of Apis cerana in the Hindu Kush-Himalayan region of western Asia. Apidologie [In Press].

Radloff, S. E. & H. R. Hepburn, 2003. Quantitative analysis of intracolonial and intercolonial morphometric variance in honeybees, Apis mellifera and Apis cerana. Apidologie [In press].

Radloff, S. E. & H. R. Hepburn, C. Hepburn, P. de la Rua, 2002. Morphometric affinities and population structure of honeybees of the Balearic Islands in the Mediterranean Sea. Journal of Apicultural Research 40: 81-90.

Radloff, S. E., R. Hepburn & S. Fuchs, 2005. The morphometric affinities of Apis cerana of the Hindu Kush and Himalayan regions of western Asia. Apidologie 36: 25-30.

Radloff, S. E., H. R. Hepburn, S. Fuchs, G. W. Otis, S. Hadisoesilo, C. Hepburn & T. Ken, 2005. Multivariate morphometric analysis of the Apis cerana populations of oceanic Asia. Apidologie 36(3): 475-492.

Radloff, S. E. & H. R. Hepburn & G. Koeniger, 2003. Comparison of flight design of Asian honeybee drones. Apidologie [In press].

Radloff, S. E., H. R. Hepburn, P. Neumann, R. F. A. Moritz & P. Kryger, 2002. A method for estimating variation in the phenotypic expression of morphological characters by thelytokous parthenogenesis in Apis mellifera capensis. Apidologie 33(2): 129-138.

Radloff, S. E., H. R. Hepburn & G. W. Otis, 2001. Flight machinery in the genus Apis (Hymenoptera: Apidae). Proceedings of the Seventh International Conference on Apiculture in Tropical Climates [In press].

Radloff, S. E., H. R. Hepburn, G. W. Otis, A. Nuru, C. Hepburn, K. Tan, S. Fuchs, 2003. Multivariate morphometric analysis of the Apis cerana populations of mainland southern Asia. Apidologie [In press].

Radloff, S. E., H. R. Hepburn, M. P. Robertson, R. van Hille, Z. Davidson, & M. H. Villet, 1995. Discriminant analysis of the honeybee populations of southwestern Africa. African Entomology 4: 1-6.

Radloff, S. E., H. R. Hepburn, M. H. Villet, 1997. Honeybees (Apis mellifera L.) of the woodland savanna of southeastern Africa. African Entomology 5: 19-27.

Radoszkowski, O. 1859. Sur quelques hyménoptères nouveaux ou peu connus de la collection du Musée de l'Académie des sciences de St. Pétersbourg. Byulleten' Moskovskogo obshchestva ispytatelei prirody 32: 479-486.

Radoszkowski, O. 1862. Sur quelques hyménoptères nouveaux ou peu connus. Byulleten' Moskovskogo obshchestva ispytatelei prirody 35: 589-598.

Radoszkowski, O. 1865. Description d’un genre nouveau, Pseudomelecta, et de quelques espèces du genre Eumenes. Horæ Societatis Entomologicæ Rossicæ 3: 53-60, pl.1.

Radoszkowski, O. 1867. Matériaux pour servir à l’étude des insectes de la Russie IV. Notes sur quelques Hyménoptères de la tribu des Apides. Horæ Societatis Entomologicæ Rossicæ 5: 73-90. Pl.III.

Radoszkowski, O. 1869. Notes synonymiques sur quelques Anthophora et Cerceris, et descriptions d’espèces nouvelles. Horæ Societatis Entomologicæ Rossicæ 6: 95-107.

Radoszkowski, O. 1872a. [Résultats de ses études hyménoptèrologique, Megachilidae.] In Séance du 3 (15) Mai. Horæ Societatis Entomologicæ Rossicæ 8: 187-200. Bulletin pp. xvi-xviii.

Radoszkowski, O. 1872b. Supplément indispensable à l’article publié par M. Gerstaecker en 1969, sur quelques genres d’ hyménoptères. Bulletin de la Société Imperiale des Naturalistes de Moscou 45: 1-40, 1 pl.

Radoszkowski, O. 1873. Supplément indispensable à l’article publié par M. Gerstaecker en 1969, sur quelques genres d’ hyménoptères. Bulletin de la Société Imperiale des Naturalistes de Moscou 47: 133-151, 1 pl.

Radoszkowski, O. 1874a. Supplément indispensable à l’article publié par M. Gerstaecker en 1969, sur quelques genres d’ hyménoptères. Bulletin de la Société Imperiale des Naturalistes de Moscou 46(3) (1873): 133-151, 1 pl.

Radoszkowski, O. 1874b. Supplément indispensable à l’article publié par M. Gerstaecker en 1969, sur quelques genres d’ hyménoptères. Bulletin de la Société Imperiale des Naturalistes de Moscou 48(1) (1873): 132-164.

Radoszkowski, O. 1876a. Matériaux pour servir à une faune hyménoptèrologique de la Russie. Trudy Russkago éntomologicheskago obshchestva 12: 82-110.

Radoszkowski, O. 1876b. Compte-rendu des hymenopteres recueilles en Egypte et Abyssinie en 1873. Trudy Russkago éntomologicheskago obshchestva 12: 111-150.

Radoszkowski, O. 1877a. In: Séance du 3 (15) Mai 1876. Trudy Russkago éntomologicheskago obshchestva 13: vii-viii.

Radoszkowski, O. 1877b. Essai d’une nouvelle méthode pour faciliter la détermination des espèces appartenant au genre Bombus. Byulleten' Moskovskogo obshchestva ispytatelei prirody 52: 169-219.

Radoszkowski, O. 1881a. In: Sitzung am 5 (17) Februar. Trudy Russkago éntomologicheskago obshchestva 16: v-vii.

Radoszkowski, O. 1881b. Hymenopteres d'Angola. J. Sci. Math. Phys. Nat. 8(31): 197-221.

Radoszkowski, O. 1882. Wiadomosciznauk Przyrodzonch zeszyt II. P. 72-81, Warsa.

Radoszkowski, O. 1883. Sur quelques espèces Russes appartenant au genre Bombus. Byulleten' Moskovskogo obshchestva ispytatelei prirody 58: 168-226.

Radoszkowski, O. 1884a. Révision des armures copulatrices des mâles du genre Bombus. Bulletin de la Société Imperiale des Naturalistes de Moscou 59: 51-92.

Radoszkowski, O. 1884b. Quelques nouveaux Hyménoptères d’Amérique. Horæ Societatis Entomologicæ Rossicæ 18: 17-22, 1 pl.

Radoszkowski, O. 1885. Révision des armures copulatrices des mâles de la tribu Philérémides. Bulletin de la Société Imperiale des Naturalistes de Moscou 61: 359-370, pls. II,III.

Radoszkowski, O. 1886. Fauna Hyménoptèrologique Transcaspienne. Horæ Societatis Entomologicæ Rossicæ 20: 3-56, pls. 1-11.

Radoszkowski, O. 1887a. Révision du genre Dasypoda Latr. Horæ Societatis Entomologicæ Rossicæ 20: 179-194, pls. XIII-XV.

Radoszkowski, O. 1887b. Hymenoptèrés de Korée. Horæ Societatis Entomologicæ Rossicæ 21: 428-436.

Radoszkowski, O. 1887c. Insecta in itinere cl. N. Przewalskii in Asia centrali novissime lecta III. Horæ Societatis Entomologicæ Rossicæ 21: 41-52, pls. ii & iii.

Radoszkowski, O. 1887d. Fauna Hymenoptera transcaspienne suit. Horæ Societatis Entomologicæ Rossicæ 21: 88-101, pls. iv & v.

Radoszkowski, O. 1887e. Sur quelques Osmia russes. Horæ Societatis Entomologicæ Rossicæ 21: 274-293. Pls. vii & viii.

Radoszkowski, O. 1887f. Etudes hyménoptèrologiques. 1. Révision des armures copulatrices de la famille Epeolus. Horæ Societatis Entomologicæ Rossicæ 21: 294-296. Pl. viii (part).

Radoszkowski, O. 1888a. Etudes hyménoptèrologiques. 1. Révision des armures copulatrices des mâles. 2. Description de nouvelles especes russes. Horæ Societatis Entomologicæ Rossicæ 22: 315-337, Taf. XII-XV.

Radoszkowski, O. 1888b. Faune hyménoptérologique transcaspienne. Horæ Societatis Entomologicæ Rossicæ 22: 338-349.

Radoszkowski, O. 1889a. [Embrology of Hymenoptera including bees]. Bull. de la Société Entomologique de France (6)ix: clxx-clxxiv.

Radoszkowski, O. 1889b. Notice sur le genre Bombus. Bulletin de la Société impériale des Naturalistes de Moscou (Menzbier, Moscow) 1889: 202-209.

Radoszkowski, O. 1890. Hymenoptères de Korée. Horæ Societatis Entomologicæ Rossicæ 24: 229-232.

Radoszkowski, O. 1891a. Revision des armures copulatrices des males du genre Colletes. Zool. Anz. 14: 249-260.

Radoszkowski, O. 1891b. Révision des armures copulatrices des mâles des genres Cilissa et Pseudocilissa. Horæ Societatis Entomologicæ Rossicæ 25: 236-243.

Radoszkowski, O. 1893a. Fauna Hyménoptèrologique Transcaspienne. Horæ Societatis Entomologicæ Rossicæ 27: 38-81.

Radoszkowski, O. 1893b. Descriptions d'hyménoptères nouveaux. Revue d'entomologie 12: 241-245.

Radoszkowski, O. 1893c. Revue des armures copulatrices des mâles des genre: Crocisa Jur., Melecta Lat., Pseudomelecta Rad., Chrysantheda Pert., Mesocheira Lep., Aglae Lep., Melissa Smith, Euglossa Lat., Eulema Lep., Acanthopus Klug. Bulletin de la Société Imperiale des Naturalistes de Moscou 7: 163-188, pls. IV,VII.

Radovic, I. T. 1981. Anatomy and function of the sting apparatus of stingless bees (Hymenoptera: Apidae: Apinae: Meliponini). Proc. Entomol. Soc. Wash. 83: 269-273.

Radovic, I. T. & P. D. Hurd, 1980. Skeletal parts of the sting apparatus of selected species in the family Andrenidae (Apoidea: Hymenoptera). Proc. Entomol. Soc. Wash. 82: 562-567.

Radovic, I. & M. D. Krunic, 1977. External morphology of the larvae of Anthophora [sic] (Amegilla) parietina (F.) var. fulvocinerea (Dours) and Anthophora (Amegilla) crinipes (Sm.) (Hymenoptera: Apoidea). Archiv Bioloskih Nauka, Beograd 27: 137-144.

Radtke, J. & E. Rademacher, 2001. Untersuchungen zum Einsatz von Thymovar zur Bekämpfung der Varroatose in Bienenvölkern. Tätigkeitsbericht LIB 2000, Deutsches Bienenjournal 7: 279-285.

Rafats, J. 1985-86. Killer bees. Spec. Ref. Briefs Natl. Agric. Libr. U.S. 01 : 11:00 PM.

Rafinesque-Schmaltz, C. S. 1814. Principes Fondamentaux de Somiologie…. Palermo. 52 pp. Privately printed.

Rafinesque-Schmaltz, C. S. 1815. Analyse de la Nature ou tableau de l’univers et des corps organisés. Palermo. 224 pp. Privately printed.

Ragheb, M. 1994. Illinois association concerned about Africanized bees. American Bee Journal 134(7): 447.

Ragsdale, D. W. & B. Furgala, 1987. A serological approach to the detection of Acarapis woodi parasitism in honey bees using an enzyme-linked immunosorbent assay. Apidologie 18: 1-9.

Ragsdale, D. W. & K. M. Kjer, 1989. Diagnosis of tracheal mite (Acarapis woodi Rennie) parasitism of honey bees using a monoclonal based enzyme-linked immunosorbent assay. American Bee Journal 129: 550-553.

Rahman, K. A. 1940. Insect pollinators of toria (Brassica napus Linn. var. dichtoma Prain), and sarson (Brassica campestris Linn.var. sarson Prain) at Lyallpur. Indian Journal of Agricultural Sciences 10: 422-447.

Rahman, K. A. & S. Singh, 1940. Beekeeping in India. Indian Farming 1: 10-17.

Rai, K. M. & B. P. Gupta, 1983. Role of honey bees and other insects as pollinators in apple and pear. Indian Bee Journal 45(2/3): 56-57.

Raina, R. & L. M. Gupta, 1999. Increasing seed yield in glory lily (Gloriosa superba) - experimental approaches. Acta Horticulturae 502: 175-179.

Rainbow, W. J. 1897. The insect fauna of Funafuti. Memoirs of Australian Museum 3: 93-102.

Raj, D., V. K. Rana, et al. 1993. Comparative studies on pollen loads and pollen constancy of Apis mellifera L. and Apis cerana indica F. on rapeseed. Journal of Entomological Research, New Delhi 17(1): 43-48.

Raj, J. & G. P. Channabasavanna, 1980. Influence of brood on the attraction and mobility of worker honey bees (Apis cerana). Mysore Journal of Agricultural Sciences 14(2): 224-226.

Rajotte, E. G. 1979. Nesting, foraging and pheromone response of the bee Colletes validus Cresson and its association with lowbush blueberries. (Hymenoptera: Colletidae) (Ericaceae: Vaccinium). Journal of the Kansas Entomological Society 52: 349-361.

Rajpurohit, A. & Rajiv K. Gupta, 2006. The impact of insect pollination on seed yield of Vigna radiata (L.) Wilczek. Proceedings of the Nationa Academy of Sciences, India 76(B) II: 178-181.

Raju, A. J. S. & V. Ezradanam, 2002. Pollination ecology and fruiting behaviour in a monoecious species, Jatropha curcas L. (Euphorbiaceae). Current Science 83(11): 1395-1398.

Raju, A. J. S., V. K. Raju, P. Victor & S. A. Naidu, 2001. Floral ecology, breeding system and pollination in Antigonon leptopus L. (Polygonaceae). Plant Species Biology 16(2): 159-164.

Raju, A. J. S. & S. P. Rao, 2002. Pollination ecology and fruiting behaviour in Acacia sinuata (Lour.) Merr. (Mimosaceae), a valuable non-timber forest plant species. Current Science 82(12): 1466-1471.

Ramalho, M. 1990. Foraging by stingless bees of the genus Scaptotrigona (Apidae, Meliponinae). Journal of Apicultural Research 29(2): 61-67.

Ramalho, M. [T.], C. Gionnini, K. Walagidi-Braaga & V. L. Imperatriz-Fonseca, 1994. Pollen harvest by stingless bees forragers (Hymenoptera, Apidae, Meliponinae). Grana 33: 239-244.

Ramalho, M., A. Kleinert-Giovannini & V. L. Imperatriz-Fonseca, 1989. Utilization of floral resources by species of Melipona (Apidae, Meliponinae): Floral preferences. Apidologie20(3): 185-196.

Ramalho, M., A. Kleinert-Giovannini & V. L. Imperatrizfonseca, 1990. Important bee plants for stingless bees and Africanized honeybees (Apis mellifera) in neotropical habitats - A review. Apidologie 21(5): 469-488.

Ramamurty, P. S. & W. Engels, 1977. Allatectomy and juvenile hormone effects on synthesis and incorporation of vitellogenin in the honeybee queen (Apis mellifica). Zool Jahrb. Abt. Allg. Zool. Physiol. Tiere. 81(2): 165-176.

Ramaraju, K. & M. Mohanasundaram, 2001. New phoretic mites (Acari : Chaetodactylidae) on carpenter bees from Tamil Nadu, India. International Journal of Acarology 27(2): 107-112.

Ramirez, B. W. 1992. 10 years of africanization in Costa Rica, the experience of a beekeeper. American Bee Journal 132(12): 795.

Ramirez, B. W. 1993. Swarming of the African bees in the Central Valley of Costa Rica, Central America. American Bee Journal 133(4): 283-284.

Ramirez, B. W. & P. L. D. Gomez, 1978. Production of nectar and gums by flowers of Monstera deliciosa (Araceae) and of some species of Clusia (Guttiferae) collected by new world Trigona bees. Brenesia 1978(14/15): 407-412.

Ramirez, B. W. & G. W. Otis, 1986. Developmental phases in the life cycle of Varroa jacobsoni, an ectoparasitic mite on honeybees. Bee World 67(3): 92-97.

Ramírez-Arriaga, E., J. I. Cuadriello-Aguilar & E. Martínez Hernández, 1996. Nest structure and parasite of Euglossa atroveneta Dressler (Apidae: Bombinae: Euglossini) at Unión Juárez, Chiapas, México. Journal of the Kansas Entomological Society 69: 144-152.

Ramirez, M. V., S. M. Rueda, V. P. Tabla, R. Ayala & J. Navarro, 2002. Diversity of native bee visitors of cucurbit crops (Cucurbitaceae) in Yucatan, Mexico. Journal of Insect Conservation 6(3): 135-147.

Ramirez-Romero, R., J. Chaufaux & M. Hà Pham-Delègue, 2005. Effects of Cry1Ab protoxin, deltamethrin and imidacloprid on the foraging activity and the learning performances of the honeybee Apis mellifera, a comparative approach. Apidologie 36(4): 601-612.

Ramírez, S. & S. A. Cameron, [In press]. Army ant attacks by Eciton hamatum and E. rapax on nests of the Amazonian bumble bee, Bombus transversalis (Hymenoptera: Apidae). Journal of the Kansas Entomological Society.

Ramírez, S., R. L. Dressler & M. Ospina, 2002. Euglossine bees (Hymenoptera: Apidae) from the Neotropical Region: A species checklist with notes on their biology. Biota Colombiana 3(1): 7-118.

Ramirez, W. 1993. Swarming of the african bees in the central valley of costa-rica, central america. American Bee Journal 133(4): 283-284.

Ramos, F. N. & F. A. M. Santos, 2006. Floral Visitors and Pollination of Psychotria tenuinervis (Rubiaceae): Distance from the Anthropogenic and Natural Edges of an Atlantic Forest Fragment. Biotropica 38(3): 383-389. [Electronic Resource: http://dx.doi.org/10.1111/j.1744-7429.2006.00152.x].

Rana, B. S., J. K. Gupta & H. K. Sharma, 2000. Status of beekeeping in Himachal Pradesh. Pp. 33-36. In: Matsuka, M., L. R. Verma, S. Wongsiri, K. K. Shrestha & U. Pratap (eds.), Asian Bees and beekeeping: Progress of research and development. Proceedings of the 4th Asian Apicultural Association International Conference, Kathmandu, Nepal. 23-28 March, 1998.

Rana, R. S. & L. R. Verma, 1994. Hoarding behaviour and lifespan of workers of Apis mellifera and Apis cerana. Journal of Apicultural Research 33(4): 205-208.

Rank, G. H. & D. W. Goerzen, 1981. Native leafcutting bee species and associated parasites in commercial hives in Saskatchewan, Canada. Apidologie 12: 211-220.

Rank, G. H. & D. W. Goerzen, 1982. Effect of incubation temperatures on emergence of Megachile rotundata (Hymenoptera: Megachilidae). Journal of Economic Entomology 75: 467-471.

Rank, G. H., D. W. Goerzen & J. H. Gerlach, 1989. Crossed immuno-electrophoresis of major protein antigens during pupation of the leafcutting bee, Megachile rotundata. Apidologie 20: 139-147.

Rank, G. H., F. P. Rank & R. Watts, 1990. Chalkbrodd (Ascosphaera aggregata Skou.) resistance of unvivoltine strain of the alfalfa leafcutting bee, Megachile rotundata F. J. Appl. Entomol. 109(5): 524-527.

Ranta, E. & H. Lundberg, 1980. Resource partitioning in bumblebees: the significance of differences in proboscis length. Oikos 35(3): 298-302.

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