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15 December 1972
Vol 178, Issue 4066

About The Cover

Portion of an ultraviolet-reflecting wing scale of the butterflye Euremalisa. The ultravoilet reflection is structural rahter than pigmentary and is caused by optical interferance in the lamellar system associated with the rides that project upward from scale. See page 1214.[Diagram by R.Loos, State University of New York at Albany]