A Study of a Polymorphic Mimic in Various Degrees of Speciation

Hymenoptera: The Natural History and Diversity of Wasps, Bees and Ants

Marshall, S.A.

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Solitary Bees (New Naturalist 146 )

Benton, T.; Owens, N.

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Solitary Bees (New Naturalist 146 )

Benton, T.; Owens, N.

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Wasps of the World: A Guide to Every Family

van Noort, S.; Broad, G.

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Bumblebees of Europe. Hymenoptera of Europe 3

Rasmont, P.; Ghisbain, G.; Terzo, M.

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Pocket Guide to the Bumblebees of Great Britain and Ireland

Lewington, R.

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