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Analysis of stomach contents of 63 adult Atelopus oxyrhynchus showed that in both sexes Coleoptera accounted for approximately 40% of the food biomass, while Hymenoptera (mostly ants), larval Lepidoptera, larval Diptera and Acarina constituted most of the remaining bulk. All other groups accounted for < 15% of total weight of stomach contents. Stomachs of ♀ ♀ usually contained almost twice as much food material as did those of the smaller ♂ ♂. Frogs taken in amplexus tended to have less material in their stomachs than did unpaired animals. Of eight amplectant ♂ ♂, six contained no identifiable food items and one contained a single beetle; average weight of stomach contents of these seven ♂ ♂ was about 25% of the average for unpaired ♂ ♂. Apparently ♂ ♂, which form amplexus several months in advance of spawning, feed only infrequently if at all during this period.
Herpetologica © 1974 Herpetologists' League