Abstract
Food entering the alimentary tract of the blow fly, Phormia regina (Meigen) usually goes first to the crop, but occasionally it moves directly to the ventriculus. Food is propelled by strong peristaltic waves from the crop, up the crop duct, through the crop valve to the esophagus. The crop valve constricts tightly and contractions in the esophagus carry food downward through the proventricular valve into the ventriculus. The rate of peristaltic propulsion of food in the crop, crop duct, and gut appears to be without pattern and is endogenously controlled.
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