
Chrysomela is a genus of leaf beetles found almost throughout the world, but missing from Australia. It contains around 40 species, including 7 in eastern and northern Europe. It also includes at least 17 species in North America, including the cottonwood leaf beetle Chrysomela scripta. ...
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http://en.wikipedia.org/wiki/Chrysomela

Chrysomela is a genus of leaf beetles (Chrysomelidae) which live on trees, mainly willows, birches, alders and poplars.
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http://www.probertencyclopaedia.com/browse/BC.HTM
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