16 May 2008
Vol 320, Issue 5878

About The Cover

Cover image expansion

COVER Male flowers of Gurania makoyana, a Central American plant in the cucumber family, harbor larvae (not visible) of two species of fly; a third fly species infests female flowers of the same species of plant. Some plant species in this family can host as many as 13 different fly species. See page 928.

Photo: Marty Condon