. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. FIG. 57. FIG. 58. _FiG. 57.—Diagram of circulatory system of a young dragon-fly; in middle is the chambered dorsal vessel, or heart, with single artery. Arrows indicate direction of blood-currents. (After Kolbe.) FIG. 58.—Diagram of ventral nerve-cord of locust, Dissosteira Carolina. (After Snodgrass.) is a knot underneath the esophagus and from it a pair of stout threads which run up and around the esophagus, one on each side, and into a larger knot lying on top of the esophagus. These knots and thread compose th
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. FIG. 57. FIG. 58. _FiG. 57.—Diagram of circulatory system of a young dragon-fly; in middle is the chambered dorsal vessel, or heart, with single artery. Arrows indicate direction of blood-currents. (After Kolbe.) FIG. 58.—Diagram of ventral nerve-cord of locust, Dissosteira Carolina. (After Snodgrass.) is a knot underneath the esophagus and from it a pair of stout threads which run up and around the esophagus, one on each side, and into a larger knot lying on top of the esophagus. These knots and thread compose the main part of the central nervous system of the caterpillar, the threads being the nerve-. 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937; Doane, Rennie Wilbur, 1871-. New York, H. Holt and company
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