. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. A tree-hopper, show- ing the mouth as a long, three-jointed sucking tube, at a,. BppeUFpeflaBrMJK Photo by M. v. Slingerland. able to observe the mandibles without the aid of a lens. The thorax is the middle region of the insect body. It is composed of three of the body seg- ments more or less firmly joined together. The segment next the head is called the prothorax, the middle one, the mesothorax, and the hind one, the metathorax. Each of these segments bears a pair of legs and, in t
. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. A tree-hopper, show- ing the mouth as a long, three-jointed sucking tube, at a,. BppeUFpeflaBrMJK Photo by M. v. Slingerland. able to observe the mandibles without the aid of a lens. The thorax is the middle region of the insect body. It is composed of three of the body seg- ments more or less firmly joined together. The segment next the head is called the prothorax, the middle one, the mesothorax, and the hind one, the metathorax. Each of these segments bears a pair of legs and, in the winged insects, the second and third segments bear the wings. Each leg consists of two small segments next to the body, next to them a longer segment, called the femur, beyond this a segment called the tibia, and beyond this the tarsus or foot. The tarsus is made up of a number of segments, varying from one to six, the most common number being five. The last segment of the tarsus usually bears one or two claws. While we have little to do with the internal anatomy of insects in elementary nature-study, the chil- dren should be taught something of the way that insects breathe. The child naturally believes that the insect, like himself, breathes through the mouth, while as a matter of fact, insects breathe through their sides. If we examine almost any insect carefully, we can find along the sides The month-Parts of a grasshopper o|, the body a series of openings. dissected off, enlarged and named. inese are called the Spiracles, and. 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, Anna Botsford, 1854-1930. Ithaca, N. Y. , Comstock Publishing Company
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