Elementary lessons on insects elementarylesson00need Year: 1928 Ventral aspect of labium B - Dorsal side of maxilla Fig. 3.—The mouthparts of stonefly nymph. Figures A and B represent the head divided hori- zontally through the esophagus e, and both halves exposed from within: /, labrum or upper lip: tn, mandibles; mx, maxillae; Ir, labium or lower lip; h, hypopharynx, or tongue. Figures C, D, and E represent these parts, detached. The thorax is composed of tnree segments, each of which bears a pair of legs. Insects proper are called Hexapods

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