DR. TICEHURST has for long been recognized as an authority on the willow-warblers, and this critical revision of that group is a model of what such a work should be. He has based it primarily on his own examination of thousands of specimens available in museum collections, and only secondarily on the previous literature. By his determination, there are thirty species in the genus and these comprise, in all, sixty-seven separable forms. They are distributed across Europe and Asia, the largest number of forms being found in the mountain ranges bordering the Tibetan plateau: two are strangely isolated on the islands of Flores and Timor.
A Systematic Review of the Genus Phyllosoopus (Willow-Warblers or Leaf-Warblers)
By Claud B. Ticehurst. Pp. viii + 193 + 2 plates. (London: British Museum (Natural History), 1938.) 10s.
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A Systematic Review of the Genus Phyllosoopus (Willow-Warblers or Leaf-Warblers). Nature 143, 316 (1939). https://doi.org/10.1038/143316b0