. Elementary entomology. Insects. ANATOMY OF INSECTS - - EXTERNAL 21 V) 3 Q~ S S3 Sgj ~o « . M-J * j^Or} 0}-°-?^ £ ^8 ^'Jft.^. ^ C (U s fc£ V VI <U <u IH -C M o 4-1 ti C cd C <u 6 o C rt cd 0) o o IH <*H u 4-1 rt i- rt CX (U rt IH O rt •s (U ca ro M 6 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 tergum, or notnm, the ven- tral or under
. Elementary entomology. Insects. ANATOMY OF INSECTS - - EXTERNAL 21 V) 3 Q~ S S3 Sgj ~o « . M-J * j^Or} 0}-°-?^ £ ^8 ^'Jft.^. ^ C (U s fc£ V VI <U <u IH -C M o 4-1 ti C cd C <u 6 o C rt cd 0) o o IH <*H u 4-1 rt i- rt CX (U rt IH O rt •s (U ca ro M 6 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 tergum, or notnm, the ven- tral or under sur- face is the sternum, and each side is a/Av/;7/;;/. These parts are further divided by sutures into distinct plates, or sclerites, 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 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 Sanderson, Dwight, 1878-1944; Jackson, C. F. (Cicero Floyd), b. 1882. Boston, New York [etc. ] Ginn and Company
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