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Cover picture: A male small white butterfly, Pieris rapae crucivora, feeding on a flower. The article by Arikawa et al. in this issue (pages 5935-5942) reports marked sexual dimorphism in the spectral sensitivity of photoreceptors that express violet-absorbing visual pigment. In females these photoreceptor cells are violet sensitive, but in males they are double-peaked blue receptors. The difference is attributed to the filtering effect of violet-absorbing fluorescing pigment found only in males.
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