. The elements of insect anatomy : an outline for the use of students in entomological laboratories. Insects -- Anatomy. 96 that these tracheae exhibit a striking similarity in their origin and mode of branching in the nymphs and pupae of the more generalized members of most of the orders of insects. We have been able, therefore, to present a hypothetical type, which we believe represents approximately what was the arrangement of the tracheae in the nymph of the primitive winged insect (Fig. 5), and, as the wing-veins of the adult are developed about the tracheae of the wing of the nymph. -Si
. The elements of insect anatomy : an outline for the use of students in entomological laboratories. Insects -- Anatomy. 96 that these tracheae exhibit a striking similarity in their origin and mode of branching in the nymphs and pupae of the more generalized members of most of the orders of insects. We have been able, therefore, to present a hypothetical type, which we believe represents approximately what was the arrangement of the tracheae in the nymph of the primitive winged insect (Fig. 5), and, as the wing-veins of the adult are developed about the tracheae of the wing of the nymph. -Si Sc,. jdA id A Fig. 5.—Diagram representing the hypothetical arrangement of the tracheae in a wing of a nymph of the primitive winged insect. the same figure will serve to indicate the probable mode of branching of the wing-veins in the adult of the primitive winged insect. The radial sector.—When the radius preserves its prim- itive mode of branching, it separates at its first fork into two unequal parts ; the first of these is vein R^ ; the other gives rise to the remaining four branches of the radius (Fig. 5), This second part of the radius, including its branches, is termed the radial sector or vein i? 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 Comstock, John Henry, 1849-1931; Kellogg, Vernon L. (Vernon Lyman), 1867-1937. Ithaca : Comstock Publishing Co.
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