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Sneath, P. H. A. & R. R. Sokal, 1973. Numerical Taxonomy – The principles and practice of numerical classification. Freeman & Co., San Francisco.

Snelling, R. R. 1956. Bees of the genus Centris in California. Pan-Pacific Entomologist 32: 1-8.

Snelling, R. R. 1966a. Studies on North American bees of the genus Hylaeus, 1. Distribution of the western species of the subgenus Prosopis with description of new forms. Contributions in Science, Los Angeles County Museum of Natural History no. 98: 1-18.

Snelling, R. R. 1966b. Studies on North American bees of the genus Hylaeus, 2. Description of a new subgenus and species. Proceedings of the Biological Society of Washington 79: 139-144.

Snelling, R. R. 1966c. Studies on North American bees of the genus Hylaeus, 3. The nearctic subgenera. Bulletin of the Southern California Academy of Sciences 65: 164-175.

Snelling, R. R. 1966d. A new species of Heteranthidium from California. Contributions in Science, Los Angeles County Museum of Natural History no. 97: 1-8.

Snelling, R. R. 1967. Description of a new subgenus of Osmia. Bulletin of the Southern California Academy of Sciences 66: 103-108.

Snelling, R. R. 1968. Studies on North American bees of the genus Hylaeus, 4. The subgenera Cephahylaeus, Metziella and Hylaeana. Contributions in Science, Los Angeles County Museum of Natural History no. 144: 1-6.

Snelling, R. R. 1969. The Philippine subgenus Hoploprosopis of Hylaeus. Contributions in Science, Los Angeles County Museum of Natural History no. 171: 1-5.

Snelling, R. R. 1970a. Studies on North American bees of the genus Hylaeus, 5. The subgenera Hylaeus s.str. and Paraprosopis. Contributions in Science, Los Angeles County Museum of Natural History no. 180: 1-59.

Snelling, R. R. 1970b. The Hylaeus of the Bonin Islands, western Pacific Ocean (Hymenoptera Colletidae). Bulletin of the Southern California Academy of Science 69(1): 1-19.

Snelling, R. R. 1974. Notes on the distribution and taxonomy of some North American Centris (Hymenoptera: Anthophoridae). Natural History Museum of Los Angeles County, Contribution in Science no.259: 1-41.

Snelling, R. R. 1975a. Taxonomic notes on some colletid bees of western North America with descriptions of new species. Contributions in Science, Los Angeles County Museum of Natural History no. 267: 1-9.

Snelling, R. R. 1975b. Range extension of two Heteranthidium, with description of Heteranthidium cordaticeps male (Hymenoptera: Megachilidae). Proceedings of the Entomological Society of Washington 77(1): 87-90.

Snelling, R. R. 1980a. New bees of the genus Hylaeus from Sri Lanka and India. Contributions in Science, Natural History Museum of Los Angeles County no. 328: 1-18.

Snelling, R. R. 1980b. The bee genus Bicornelia (Hymenoptera: Colletidae). Contributions in Science, Publ. Natural History Museum of Los Angeles 327: 1-6.

Snelling, R. R. 1981. Systematics of social Hymenoptera. Social Insects 2: 369-453.

Snelling, R. R. 1982. The taxonomy of some neotropical Hylaeus and descriptions of new taxa (Hymenoptera: Colletidae). Bulletin of the Southern California Academy of Sciences 81(1): 1-25.

Snelling, R. R. 1983a. Studies on North American bees of the genus Hylaeus, 6. On adventive Palaearctic species in southern California. Bulletin of the Southern California Academy of Sciences 82: 12-16.

Snelling, R. R. 1983b. North American species of the bee genus Lithurge. Contributions in Science, Los Angeles County Museum of Natural History no. 343: 1-11.

Snelling, R. R. 1984. Studies on the taxonomy and distribution of American centridine bees. Natural History Museum of Los Angeles County, Contribution in Science no.347: 1-69.

Snelling, R. R. 1985. The systematics of the hylaeine bees (Hymenoptera: Colletidae) of the Ethiopian zoological region: The genera and subgenera with revisions of the smaller groups. Natural History Museum of Los Angeles County, Contribution in Science no.361: 1-33.

Snelling, R. R. 1986a. Contributions toward a revision of the new world nomadine bees: A partitioning of the genus Nomada. Natural History Museum of Los Angeles County, Contribution in Science no.376: 1-32.

Snelling, R. R. 1986b. The taxonomic status of two North American Lithurge. Bulletin of the Southern California Academy of Sciences 85: 29-34.

Snelling, R. R. 1987. A revision of the bee genus Aztecanthidium. Pan-Pacific Entomologist 63: 165-171.

Snelling, R. R. 1988a. A new species of Centris (Melanocentris) from Cerro de la Neblina, Venezuela (Hymenoptera: Anthophoridae). Entomological News 99(1): 13-16.

Snelling, R. R. 1988b. The generic placement of Prosopis? Allodape? mustela Vachal, 1895 (Hymenoptera: Apoidea). Entomological News 99(1): 10-12.

Snelling, R. R. 1990. A review of the native North American bees of the genus Chalicodoma. Natural History Museum of Los Angeles County, Contribution in Science no. 421: 1-39.

Snelling, R. R. 1994. Diadasia, subgenus Dasiapis, in North America. Contributions in Science, Los Angeles County Museum of Natural History no. 448: 1-8.

Snelling, R. R. 2003. Bees of the Hawaiian Islands, exclusive of Hylaeus (Nesoprosopis) (Hymenoptera: Apoidea). Journal of the Kansas Entomological Society 76(2): 342-356.

Snelling, R. R. & R. W. Brooks, 1985. A review of the genera of cleptoparasitic bees of the tribe Ericrocini (Hymenoptera: Anthophoridae). Natural History Museum of Los Angeles County, Contribution in Science no.369: 1-34.

Snelling, R. R. & B. N. Danforth, 1992. A review of Perdita, subgenus Macrotera (Hymenoptera: Andrenidae). Contributions in Science, Los Angeles County Museum of Natural History no. 436: 1-12.

Snelling, R. R. & J. G. Rozen Jr., 1987. Contributions toward a revision of the New World nomadine bees. 2: The genus Melanomada (Hymenoptera: Anthophoridae). Contributions in Science, Natural History Museum of Los Angeles County 384: 1-12.

Snelling, R. R. & G. I. Stage, 1955a. Systematics and biology of the bee genus Xeralictus. Contributions in Science, Los Angeles County Museum of Natural History no. 451: 1-17.

Snelling, R. R. & G. I. Stage, 1955b. A revision of the nearctic Melittidae: The subfamily Melittinae. Contributions in Science, Natural History Museum of Los Angeles County no. 451: 19-31.

Snelling, R. R. & T. J. Zavortink, 1984. A revision of the cleptoparasitic bee genus Ericrocis (Hymenoptera: Anthophoridae). Wasmann Journal of Biology 42(1/2): 1-26.

Snodgrass, R. E. 1928. Morphology and evolution of the insect head and its appendages. Smithsonian Miscellaneous Collections 81(3): 1-158.

Snodgrass, R. E. 1935. Principles of Insect Morphology. McGraw-Hill, N.York. 667 p.

Snodgrass, R. E. 1941. The male genitalia of Hymenoptera. Smithsonian Miscellaneous Collections 99(14): 1-86, pls. 1-33.

Snodgrass, R. E. 1942. The skeleto-muscular mechanisms of the honey bee. Smithsonian Miscellaneous Collections 103(2): 1-120.

Snodgrass, R. E. 1956. Anatomy of the Honey Bee. xiv + 334 pp. Comstock Publishing Associates, Ithaca/NY.

Snow, A. A. & D. W. Roubik, 1987. Pollen deposition and removal by bees visiting two tree species in Panama. Biotropica 19: 57-63.

Snyder, A. W. & R. Menzel, 1975. Photoreceptor Optics. Heidelberg, Berlin, New York: Springer Verlag.

Snyder, A. W., R. Menzel & S. B. Laughlin, 1973. Structure and function of the fused rhabdom. J. Comp. Physiol. 87: 99-135.

Snyder, T. P. 1977. A new electrophoretic approach to bio-chemical systematics of bees. Biochemical Systematics and Ecology 5: 133-150.

Snyder, T. P., E. M. Barrows & M. R. Chbot, 1976. Nests of Diadasia afflicta Cresson. Journal of the Kansas Entomological Society 49: 200-203.

Snow, A. A. & D. W. Roubik, 1987. Pollen deposition and removal by bees visiting two tree species in Panama. Biotropica 19(1): 57-63.

Snow, D. W. 1997. Should the biological be superseded by the phylogenetic species concept? Bulletin of the British Ornithologists’ Club 117: 110-121.

Snyder, A. W. & R. Menzel, 1975. Photoreceptor Optics. Heidelberg, Berlin, New York: Springer Verlag.

Snyder, A. W., R. Menzel & S. B. Laughlin, 1973. Structure and function of the fused rhabdom. J. Comp. Physiol. 87: 99-135.

Soares, A. E. E. 1981. Chartreuse-limao: first eye mutation induced by gamma radiation with 60Co cobalt isotope in the honeybee Apis mellifera adansonii. Journal of Apicultural Research 20 (3): 137-139.

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Sobakinskikh, V. I. 1986b. African honeybees on the American continent and at home. Pchelovodstvo 9 : 25-26 (concluded).

Sobenko, J. 1997. Caixa prática para "jatai". Mensagem Doce 42: 12-13. Brasil. Societies monogynes et digynes. Insectes Sociaux 20: 297-320.

Sobonya, R. E., & J. O. Schmidt, 1997. Not a "Bee-zoar," but a wasp. N. Engl. J. Med. 337: 575.

Soderstrom, B., B. Svensson, K. Vessby & A. Glimskar, 2001. Plants, insects and birds in semi-natural pastures in relation to local habitat and landscape factors. Biodiversity and Conservation 10(11): 1839-1863.

Soderstrom, T. R. & C. E. Calderon, 1971. Insect pollination in tropical rain forest grasses. Biotropica 3: 1-16.

Sodre, G. da S., L. C. Marchini & C. A. L. de Carvalho, 2002. Honey physico-chemical characteristics - Apis mellifera L. 1758 – the northern coast of Bahia State. Revista de Agricultura (Piracicaba) 77(2): 243-256.

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Soika, A. G. 1932. Études sur les larves des hyménoptères (l re note). Annales de la Société Entomologique de France 101: 127-130.

Soika, A. G. 1933. Studi sulle larve degli Imenotteri (3a nota). Bollettino della Societa Veneziana de Storia Naturale 1: 21-26.

Soika, A. G. 1934. Etudes sur les larves des hyménoptères (2e note). Annales de la Société Entomologique de France 103: 337-343.

Soika, A. G. 1936. Etologia e larva primaria di Melecta luctuosa Scop. (Hym., Apidae). Bollettino della Societa Entomologica Italiana 68: 47-48.

Sokol, R. 2000. Diseases in selected apiaries in Poland. Medycyna Weterynaryjna 56(12): 785-787.

Sokal, R. R. & F. J. Rohlf, 1981. Biometry. 2nd Edition. Freeman, New York, NY.

Sokal, R. R. & F. J. Rohlf, 1995. Biometry. 3rd Edition. W. H. Freeman, New York.

Sole, C. L., P. Kryger, A. Hefetz, T. Katzav-Gozansky, & R. M. Crewe, 2002. Mimicry of queen Dufour's gland secretions by workers of Apis mellifera scutellata and A. m. capensis. Naturwissenschaften 89(12): 561-564.

Solignac, M., J. M. Cornuet, D. Vautrin, Y. Le Conte, D. Anderson, J. Evans, S. Cros-Arteil, M. Navajas, 2005. The invasive Korea and Japan types of Varroa destructor, ectoparasitic mites of the Western honeybee (Apis mellifera), are two party isolated clones. Proceedings Biological Sciences 272(1561): 411-419.

Solignac, M., D. Vautrin, A. Loiseau, F. Mougel, E. Baudry, A. Estoup, L. Garnery, M. Haberl & J. M. Cornuet, 2003. Five hundred and fifty microsatellite markers for the study of the honeybee (Apis mellifera L.) genome. Molecular Ecology Notes 3(2): 307-311.

Solinas, M. & F. Bin, 1965a. Osservazioni sugli insetti impollinatori dell leguminose foraggere (Medicago sativa e Trifolium patense) nella pianura Padana. Parte I. Sementi Elette 11(2): 50-61.

Solinas, M. & F. Bin, 1965b. Osservazioni sugli insetti impollinatori dell leguminose foraggere (Medicago sativa e Trifolium patense) nella pianura Padana. Parte II. Sementi Elette 11(2): 108-128.

Sollenberger, T. L. 2005b. Beedevilment. 2. Conclusion. American bee journal 145(1): 56-58.

Sollenberger, T. 2005. Sol & waters adventures in beeland "Urban Safari". American bee journal 145(3): 225-228.

Sollenberger, T. 2005. Set the stage for a successful spring with fall requeening. American bee journal 145(8): 637-639.

Sollenberger, T. 2005a. The curious case of the intercaste queens. American bee journal 145(10): 808-810.

Sollenberger, T. 2006b. Antics. American bee journal 146(5): 401-402.

Sollenberger, T. 2006c. Fire antics. American bee journal 146(6): 501-503.

Sollenberger, T. 2006a. Ant-free certification for almond pollination. American bee journal 146(7): 581-583.

Solov'eva, L. F. 2001. Evaluation of the level of danger from Calypso to honey bees. Zashchita i Karantin Rastenii No. 8: 26.

Soltesz, M., P. Benedek, J. Nyeki, Z. Szabo & T. Toth, 2001. Flower visiting activity of honeybees on fruit species blooming subsequently. International Journal of Horticultural Science 7(1): 12-16.

Solys, Z. 2000. Peculiarities of the occurence of American foulbrood. Zemdirbyste, Mokslo Darbai No. 72: 281-287.

Somanathan, H. & R. M. Borges, 2001. Nocturnal pollination by the carpenter bee Xylocopa tenuiscapa (Apidae) and the effect of floral display on fruit set of Heterophragma quadriloculare (Bignoniaceae) in India. Biotropica 33(1): 78-89.

Somerville, D. 1995. Pollination of faba beans. Report to Honeybee Research Development Council, D.A.N. 19H.

Somerville, D. 2000. Pollen trapping and storage. Agnote - NSW Agriculture DAI-207(1st Ed.): 1-4.

Sommeijer, M. J., L. L. M. de Bruijn & F. J. A. J. Meeuwsen, 2003. Reproductive behaviour of stingless bees: solitary gynes of Melipona favosa (Hymenoptera: Apidae, Meliponini) can penetrate existing nests. Entomologische Berichten 63(2): 31-35.

Sommeijer, M. J., L. L. M. de Bruijn, F. J. A. J. Meeuwsen & E. P. Martens, 2003. Natural patterns of caste and sex allocation in the stingless bees Melipona favosa and M. trinitatis related to worker behaviour. Insectes Sociaux 50(1): 38-44.

Sommeijer, M. J., L. L. M. de Bruijn, F. J. A. J. Meeuwsen & E. J. Slaa, 2003. Reproductive behaviour of stingless bees: nest departures of non-accepted gynes and nuptial flights in Melipona favosa (Hymenoptera: Apidae, Meliponini). Entomologische Bericheten 63(1): 7-13.

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Sommer, P. G. 1979b. Behavior of Africanized honeybees [Apis mellifera adansonii] in Parana (Brazil) before the observations made during the 1960-1977 period. Gac. Colmenar 41 (7): 342-343, 395.

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