04 April 1980
Vol 208, Issue 4439

About The Cover

Fireflies glowing after exposure to the formamidine pesticide, chlordimeform. Of the ten insects, nine were treated with 1 microgram each of chlordimeform. The tenth firefly, which is unlit, was treated only with the acetone solvent. See page 74. [Jeffrey A. Leister, Department of Entomology, Purdue University, West Lafayette, Indiana]