British Wildlife Wiki
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The Elm Spanworm (Ennomos subsignaria) is a moth in the Geometridae family.

This species is a infrequent import to Britain from North America, usually amongst asparagus from Florida. Similar to Britain's thorns, and holds it's wings like the Purple Thorn, this species is completly white.

Ennomos subsignaria

Elm Spanworm - Courtesy of Wikipedia

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