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The tree squirrel bot fly, Cuterebra emasculator Fitch, is an obligate parasite of tree squirrels and chipmunks throughout most of eastern North America. The adult and other life stages are seldom seen; instead, what is usually observed from July through September or October is the outcome of infestation, namely the relatively large, fluid-draining swellings in a host’s hide caused by the subcutaneous larvae.
