Abstract
Insects are capable of discriminating between water and sugar solutions. The responsible sensory organs, the taste hairs, densely populate the surface of their legs (Fig. 2) and mouthparts, and are characterized by the following properties: 1. The taste hairs always show a simple morphological construction; the whole sense organ consists of only eight cells, five primary bipolar receptor cells and three sheath cells (Section 1). 2. Each receptor cell is sensitive to one class of substances only. So one cell is specifically stimulated by carbohydrates, while others react to salts and water (Section 3). 3. The activity of the sugar receptor cell in hungry flies is strongly coupled with a feeding response (Section 2).
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