Abstract
The anatomy and histology of both the mouthparts and alimentary canal and associated tissues (salivary glands and malpighian tubules) of A. quadrimaculatus larvae are described in detail. Physiological information on rhythmical movements found in the intact alimentary canal indicates that each major region has a high degree of activity independent of contiguous regions. The foregut and hindgut have only peristaltic contractions. The midgut exhibits predominantly antiperistaltic waves which are initiated by periodic peristaltic contractions. Effects of various drugs, selected insecticides, ligaturing, and cauterization of various ganglia suggest that most activities of the canal are essentially myogenic rather than neurogenic in character.
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