. The elements of insect anatomy; an outline for the use of students in entomological laboratories. REPRODUCTIVE ORGANS OF A LOCUST. I. MALE. 1. Two testes, each testis consisting of many testicular follicles. 2. Two vasa defercntia. 3. Several seminal vesicles, each an appendage of a vas def- erens. 4. Two accessory glands, each an appendage of a vas def- erens. 5. An ejaculatory duct, the united vasa deferentia. 6. A penis. II. FEMALE. 1. Two ovaries, each ovary consist ing of many egg-tubes. 2. Two oviducts. 3. Two egg-calyces, each calyx an enlarged portion of an ovi- duct. 4. Two colleter
. The elements of insect anatomy; an outline for the use of students in entomological laboratories. REPRODUCTIVE ORGANS OF A LOCUST. I. MALE. 1. Two testes, each testis consisting of many testicular follicles. 2. Two vasa defercntia. 3. Several seminal vesicles, each an appendage of a vas def- erens. 4. Two accessory glands, each an appendage of a vas def- erens. 5. An ejaculatory duct, the united vasa deferentia. 6. A penis. II. FEMALE. 1. Two ovaries, each ovary consist ing of many egg-tubes. 2. Two oviducts. 3. Two egg-calyces, each calyx an enlarged portion of an ovi- duct. 4. Two colleterial glands, each a cephalic prolongation of an oviduct. 5. A vagina, the united oviducts. 6. An ovipositor. 7. A bursa copulatrix and a sper- matheca with a duct connect- ing them. The respiratory to the study of Corydalis. Make a diagram showing the arrangement of the larger tracheae. The walls of the tracheae are composed of three layers, which correspond to the layers of the body-wall ; in fact the tracheae are invaginations of the body- wall. The continuity of the membranes of the tracheae and body-wall is shown diagrammat- ically in Figure i. It should be observed that it is the inner layer of the wall of the tracheae that corresponds with the outer layer of the wall of the body. This inner layer of the wall of the trachea, the intima, like the cuticle, is chitinous, and is shed from the tracheae with the cuticle when the insect molts. This layer of the trachea is furnished with thickenings, which. FIG. i.—Section of trachea and body-wall, c, cuticle ; hy^ hypo- dermis ; sp, spiral thickening of the intima. The third layer is a delicate membrane bounding the ental ends of the hypoder- mal cells ; this is the basement 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,
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