Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 TIIOEAX. 525 totally aborted, or, at any rate, become functionless, it is obvious a Fio. 432.—Oral apparatus of Butterflies (after Savigny). a, Of Zyg&na; b, of Noctua. A, Antenna'; Oc, eyes; Lr, upper lip; Md, mandible; Mxt, maxillary palp; Mi, maxilla (first) ; Li, labial palp, cut away. that no sharp line can be drawn between the piercing and sucking forms of oral apparatus (fig. 434). The next principal region o
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 TIIOEAX. 525 totally aborted, or, at any rate, become functionless, it is obvious a Fio. 432.—Oral apparatus of Butterflies (after Savigny). a, Of Zyg&na; b, of Noctua. A, Antenna'; Oc, eyes; Lr, upper lip; Md, mandible; Mxt, maxillary palp; Mi, maxilla (first) ; Li, labial palp, cut away. that no sharp line can be drawn between the piercing and sucking forms of oral apparatus (fig. 434). The next principal region of the body in Insects is the thorax, which is con- nected with the head by a slender neck. It consists of three segments, and bears three pairs of legs and usually two pairs of wings on the dorsal surface. These three segments, the prothorax, the meso- thorax and the metathorax are rarely simple horny rings, but are usually com- posed of several parts united by sutures. In each segment a dorsal plate, lateral regions and a ventral plate can be dis- tinguished. These may be termed notum, pleura and sternum respectively, and they may further be described, according to the segments in which they occur, as pro-, meso- and meta-notum, and pro-, meso-, and meta-sternum. The lateral regions are divided into an anterior piece (epiatemum) and a posterior (epimerum), FIG. 433.—Mcuth parts of Nepti cinerea (after Sa-, vigny). U!, Lower lip (.abium) or rostrum ; Lr upper lip ; M:J, mandible; MX, maxilla (first).
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