Abstract
The dry-weight composition of the diet and the food preferences were determined for Anabrus simplex Haldeman, inhabiting an arid ponderosa pine-bunchgrass community in northern Colorado. Thirty-five plant species were microscopically identified from the crops of this insect. Only 2-4 staple foods occurred in the diet during any period. Although primarily herbivorous, Mormon crickets were found to be carnivorous and fungivorous. Forbs contributed an average of about 50% of the diet, while arthropods and fungi contributed about 21 and 16%, respectively. Grasses, clubmoss. and grasslike plants comprised about 6, 5, and 2% of the diet, respectively. Diet and food preference changed as the season progressed.
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