Published in Proceedings of the Entomological Society of Washington, in 2007, in volume 109, pages 45-51

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Published in Journal of Hymenoptera Research, in 2010, in volume 19, pages 159-178

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Published in Proceedings of the Entomological Society of Washington, in 1998, in volume 100, pages 72-87

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Published in Proceedings of The Entomological Society of Washington, in 1995, in volume 97, pages 900

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Published in Journal of Hymenoptera Research, in 2002, in volume 11, issue 2, pages 167-187

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Published in Journal of Hymenoptera Research, in 2007, in volume 16, pages 192-205

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Published in Proceedings of the Entomological Society of Ontario, in 1985, in volume 116, pages 61-103

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Published in Life sciences contributions, in 1994, in volume 157, pages 1-174

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Published in Journal of Hymenoptera Research, in 1994, in volume 3, pages 241-277

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Published in Entomological News, in 1998, in volume 109, pages 369-374

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Published in Journal of Hymenoptera Research, in 2000, in volume 9, pages 142-169

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Published in Journal of Hymenoptera Research, in 2002, in volume 11, issue 2, pages 213-270

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Published in Proceedings of the Entomological Society of Washington, in 1990, in volume 92, pages 248-258

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Published in Journal of Hymenoptera Research, in 1993, in volume 2, pages 169-182

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Published in Journal of The Entomological Society of Ontario, in 2007, in volume 138, pages 33-47

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Published in Proceedings of the Entomological Society of Washington, in 1996, in volume 98, pages 1-35

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Published in Asa Gray correspondence. Senders Be-Bo, in 1853, pages 1-2

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Published in Asa Gray correspondence. Senders Be-Bo, in 1858, pages 1-2

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Published in Asa Gray correspondence. Senders Be-Bo, in 1868, pages 1

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Published in Madroño, in 1943, in volume 7, issue 1, pages 18-27

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Published in Torreya, in 1928, in volume 28, issue 5, pages 94-95

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Published in Rhodora, in 1940, in volume 42, issue 497, pages 145-157

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Published in Botanical Gazette, in 1892, in volume 17, issue 5, pages 137-141

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Published in Botanical Gazette, in 1899, in volume 28, issue 4, pages 275

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Published in Madroño, in 2013, in volume 60, pages 258-259

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Published in Botanical Gazette, in 1886, in volume 11, issue 5, pages 120

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Published in Botanical Gazette, in 1889, in volume 14, issue 3, pages 82-83

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Published in Botanical Gazette, in 1892, in volume 17, issue 8, pages 254-256

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Published in The Coleopterists Bulletin, in 1978, in volume 32, issue 4, pages 310

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Published in Rhodora, in 1970, in volume 72, issue 789, pages 130-136

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Published in Botanical Gazette, in 1886, in volume 11, issue 10, pages 275-276

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Published in Botanical Gazette, in 1891, in volume 16, issue 6, pages 180

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Published in Botanical Gazette, in 1889, in volume 14, issue 11, pages 290-291

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Published in Botanical Gazette, in 1889, in volume 14, issue 8, pages 200

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Published in Botanical Gazette, in 1895, in volume 20, issue 1, pages 31

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Published in Victorian naturalist, in 2001, in volume 118, pages 277-283

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Published in Torreya, in 1929, in volume 29, issue 1, pages 15-16

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Published in Botanical Gazette, in 1892, in volume 17, issue 11, pages 348-352

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