. Elementary entomology. Entomology. 36 ELEMENTARY ENTOMOLOGY asphyxiate them through the well-developed tracheal system, though occasionally the valves of the spiracles are so well developed that an insect may keep them closed for a long time, so that fumiga- tion, in order to be fatal, must be prolonged. Muscular system. Insects are well provided with powerful mus- cles, a caterpillar having some two thousand. The muscles are yellowish in color, and the fibers are striated as in the voluntary muscles of vertebrates. The simplest type of muscles is found in larvae and in the abdominal segment
. Elementary entomology. Entomology. 36 ELEMENTARY ENTOMOLOGY asphyxiate them through the well-developed tracheal system, though occasionally the valves of the spiracles are so well developed that an insect may keep them closed for a long time, so that fumiga- tion, in order to be fatal, must be prolonged. Muscular system. Insects are well provided with powerful mus- cles, a caterpillar having some two thousand. The muscles are yellowish in color, and the fibers are striated as in the voluntary muscles of vertebrates. The simplest type of muscles is found in larvae and in the abdominal segments of adult insects, where the. adc. 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; Metcalf Collection (North Carolina State University). NCRS. Boston, Ginn
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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
