Contents

05 September 1986
Vol 233, Issue 4768

About The Cover

Cover image expansion

Inhibition of insect juvenile hormone esterase delays metamorphosis resulting in giant larvae up to 15 grams in weight (right), which spend twice as much time feeding in the ultimate instar and consume three times as much food as the smaller animal (left). See page 1073. [M. Philpott, Department of Entomology, University of California, Davis 95616]