. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. NEUROPTERA AND COLEOPTERA 303 coel). At this time the neural groove is deep, and ectodermal cells on each side differentiate to form the neuroblasts. The tracheal system has also started, developing tracheal invaginations {tr) occurring in eight segments of the abdomen. Later on, two pairs of tracheal openings will. ^^'ir ^m0 "^"'"s 5^ Fig. 247.—Brachyrhinus. Cross section through the thorax
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. NEUROPTERA AND COLEOPTERA 303 coel). At this time the neural groove is deep, and ectodermal cells on each side differentiate to form the neuroblasts. The tracheal system has also started, developing tracheal invaginations {tr) occurring in eight segments of the abdomen. Later on, two pairs of tracheal openings will. ^^'ir ^m0 "^"'"s 5^ Fig. 247.—Brachyrhinus. Cross section through the thorax of 90-hour embryo, (fiod) Coelomic cavity, {neurg) Neural groove, (tr) Tracheal invagination. be evident in the thorax. These appear clearly on the eighth day (Fig. 248). Between the fourth and the eighth days, the embryo grows laterally around the yolk and becomes shorter until the caudal end Kes at the posterior pole of the egg. At first the gnathal and thoracic appendages as well as the antennae are elongate and slender (Fig. 245). Soon they. 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 Johannsen, O. A. (Oskar Augustus), 1870-1961; Butt, Ferdinand Hinckley, 1899-. New York, London, McGraw-Hill Book Company, inc.
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