. Elementary entomology . the mesothorax and metathorax of most adult insects bear a pair of wings. The prothorax is usually smaller than the two posterior seg- ments, the relative size of which de- pends upon which pair of wings is the better developed. The dorsal surface, or back, of a tho- racic segment is called the tergmn, or notinn, the ven- tral or under sur- face is the sternum, and each side is a plcurum. These parts are further divided by sutures into distinct plates, or sclcritcs, to which the appendages are articulated. The de- velopment, shape, size, and position of these sclerite
. Elementary entomology . the mesothorax and metathorax of most adult insects bear a pair of wings. The prothorax is usually smaller than the two posterior seg- ments, the relative size of which de- pends upon which pair of wings is the better developed. The dorsal surface, or back, of a tho- racic segment is called the tergmn, or notinn, the ven- tral or under sur- face is the sternum, and each side is a plcurum. These parts are further divided by sutures into distinct plates, or sclcritcs, to which the appendages are articulated. The de- velopment, shape, size, and position of these sclerites are characters of such uniformity that the sclerites are used in classifying in- sects, in much the same way as are the bones of the vertebrate animals.
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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
