. A text-book of agricultural zoology. Zoology, Economic. 90 ANATOMY OF AN AftTHEOPOD. 32 A, c), a broad plate, which is followed by a smaller plate united to the front of the clypeus, called the labrum or "upper lip" {L). The plate on each side below and behind the eyes is called the gena or cheek (G). Ocelli are absent in this type, other- wise they would be situated on the epicranium. The thorax. Fig. 31.—Structure of an Arthropod {Periplaneta wmeHcarm). Hf head; Th, thorax; Ab, abdomen; Mxp, maxillary palps; Zp, labial palps; Jlf, maxillse; Antf antennae; E, eyes; Ep, epicranium;

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. A text-book of agricultural zoology. Zoology, Economic. 90 ANATOMY OF AN AftTHEOPOD. 32 A, c), a broad plate, which is followed by a smaller plate united to the front of the clypeus, called the labrum or "upper lip" {L). The plate on each side below and behind the eyes is called the gena or cheek (G). Ocelli are absent in this type, other- wise they would be situated on the epicranium. The thorax. Fig. 31.—Structure of an Arthropod {Periplaneta wmeHcarm). Hf head; Th, thorax; Ab, abdomen; Mxp, maxillary palps; Zp, labial palps; Jlf, maxillse; Antf antennae; E, eyes; Ep, epicranium; /, fenestrEe; P, prothorax; M, mesothorax; Jlfe.metathorax; Ce, cerci; S, styles; Mw and Mew, meso- and meta- thoracic wings; PZ, Af.Z, and Me.lj legs; Fe, femur; Ti, tibia; Tr^ tarsus; 1-10, abdom- inal segments. is composed of three segments, united by sutures. Each seg- ment is known respectively as the pro-, meso-, and metathorax (fig. 31, Th). The tergum or pronotum, the upper portion, is prolonged over the neck. The mesothorax, which is smaller than the prothorax, bears a pair of leathery wings. These. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons

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