Abstract
ABOUT a hundred years ago, it was gradually dawning on British entomologists that many of the butterflies in this country might be immigrants from abroad. Among the species first suspected of this habit were the Clouded Yellow (Colias. croceus) and the Pale Clouded Yellow (C. hyale). It is curious that about the same time a more practical controversy was commencing in the United States as to whether one of their most serious pests, the cotton worm (Alabama argillacea) was a permanent resident of that country, or not. To-day we know that not only these early disputed species, but also many other Lepidoptera, dragonflies, and some members of other groups of insects, regularly migrate, and that in a number of cases these movements come to an end in the British Isles, thus giving the insects in question the status of ‘immigrants’.
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WILLIAMS, C. Immigration of Insects into the British Isles. Nature 135, 9–10 (1935). https://doi.org/10.1038/135009a0
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DOI: https://doi.org/10.1038/135009a0