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Cover Illustration: Leptonycteris curasoae visiting flowers of Stenocereus stellatus in a wild populat ion in Zapotitlán de las Salinas, Tehuacán Valley, Mexico. See Casas et al.: Reproduct ive biology and the process of domestication of the columnar cactus Stenocereus stellatus in Central Mexico, pp. 534-542 in this issue. Photo credit: Jose Antonio Soriano, Instituto de Ecologia, UNAM.