Abstract
Field data for life tables of the range caterpillar, Hemileuca oliviae Cockerell, were collected weekly from two sites in Union County, N.M. The wandering-quarter method, a plotless technique, was used to estimate densities of the gregarious early instars. Densities of older life stages were estimated by counting all individuals within randomly established quadrats. Development from egg eclosion (middle of May) to adult took 130 to 160 days. Original populations were reduced at least by 60% by instar IV. Principle factors contributing to mortality included heavy rainfall, poor nutritional quality of grass due to drought, predation, and parasitism by the tachinid Exorista mella (Walker).
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