Abstract
WITH reference to the swarms of butterflies referred to by M. Forel, in NATURE, vol. xx. p. 197, it may be interesting to mention that Vanessa cardui is this year very common in the south of England. This butterfly is known to all English lepidopterists to be “periodical”—in some seasons it occurs in great numbers, in others—perhaps for several years in succession—not one specimen is to be seen.
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JENNER, J. Butterfly Swarms. Nature 20, 220 (1879). https://doi.org/10.1038/020220g0
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DOI: https://doi.org/10.1038/020220g0
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