
Thaumetopoeidae (sometimes incorrectly spelled `Thaumatopoeidae`) is a small family of moths in the order Lepidoptera. The genera in this family have been historically treated as a subfamily within Notodontidae instead. The larval stage of some Thaumetopoeidae are known as processionary caterpillars, so named because they move in columns in sear.....
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http://en.wikipedia.org/wiki/Thaumetopoeidae

Thaumetopoeidae is the processionary moths family of insects of the order Lepidoptera. There are about eighty species in the family, of which only a few live in Europe. The members are characterised by one pair of spurs on the hind tibiae, and the body tufted with hairs. The mouthparts are degenerate, the antennae pectinate and the caterpillars liv...
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http://www.probertencyclopaedia.com/browse/BT.HTM
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