. Biologia; la storia di esseri viventi. 202 Organismi che illustra i principi biologici uno studio dei disegni illustrazione indica che l'ape, come altri insetti, ha tre divisioni del corpo - Testa, torace, e abdo- uomini, ma invece dei soliti tre parti toracica, vi sono quattro, poiché un segmento dal ventre diventa fusi con il torace. ocellus o- Semplice^ occhio occhio composto. ctntcnna. •MomcCible Tnaxilla ccndi othei^ bocca porti-- Sting ape operaia, vista laterale, i peli rimossi, che mostra le parti del corpo ed appendici sul lato sinistro. (Dopo Snodgrass.) lasciando solo sei visibile segm

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. Biology; the story of living things. 202 ORGANISMS ILLUSTRATING BIOLOGICAL PRINCIPLES A study of the accompanying illustration indicates that the bee, like other insects, has three body divisions — head, thorax, and abdo- men, but instead of the usual three thoracic parts, there are four, since one segment from the abdomen becomes fused with the thorax, . ocellus or- Simple^ eye Compound eye. ctntcnna. •momcCible Tnaxilla ccndi othei^ mouth ports-- Sting Worker bee, lateral view, hairs removed, showing parts of body and appendages on left side. (After Snodgrass.) leaving only six visible segments in the abdomen. The head bears a pair of jointed antennae, or "feelers, " large compound eyes, and mouth parts much modified from the plan shown by the locust. Three pairs of jointed legs and two pairs of membranous wings are attached to the thorax, the wings growing out of the meso- and meta- thorax. At the posterior end of the abdomen an ovipositor in the female is modified in the worker into a sting, which is withdrawn inside its sheath within the body when not in use. The body is covered with a horny three-layered coat made up of an outer chitiii- ous cuticula that covers the entire body except at the joints, where it becomes membranous, thus allowing movement; a middle layer of cells called the hypodermis; and an inner delicate basement mem- brane. Protruding from the chitinous covering are many hairs and bristles, outgrowths formed by the hypodermis, in which there are several kinds of cells, some forming the chitinous coat, others the hairs, and still others gland or sensory cells. In some cases the hairs are hollow and contain sensory nerve endings. We must picture these animals covered with heavy armor, through which sensation is impossible. 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

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