Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] 228 ZOOLOGY body made up of segments, having jointed appendages, three pairs of legs, and breathing through a system of air tubes called trachece. It also belongs to the order Orthoptera (straight wings) because the hind wings, when at rest, lie folded up length- wise close to the body. Locust (red-legged grasshopper); Ah, abdomen; Ant., antennae; E, eye; M, mouth; P, pads on feet; T, thorax. External Structure} — Any common form
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] 228 ZOOLOGY body made up of segments, having jointed appendages, three pairs of legs, and breathing through a system of air tubes called trachece. It also belongs to the order Orthoptera (straight wings) because the hind wings, when at rest, lie folded up length- wise close to the body. Locust (red-legged grasshopper); Ah, abdomen; Ant., antennae; E, eye; M, mouth; P, pads on feet; T, thorax. External Structure} — Any common form, as Melanoplus femur-rubrum, may be used. Examine the body of the grass- hopper. The anterior region is the head, the middle part the thorax, the posterior the abdomen. To which region are wings and legs attached? Which region is the stoutest? Notice that the body is covered with an exoskeleton. This is composed of chitin, a substance chemically akin to that of a cow's horn. The grasshopper makes its home in fields of grass. Some species live in vacant lots where there is considerable earth exposed. Do such grass- hoppers ever have the color of their surroundings ? How might this be of service to them? Examine the legs of a living grasshopper, with a view to finding out their position when at rest. Examine the hind legs. Do you find any adapta- tions present which fit the legs for jumping ? Examine the hooks and pads on the last segment or tarsus. Look for other adaptations. Besides flying and hopping, the grasshopper also crawls. In a resting position, it clings by means of the hooks and pads on the foot or tarsus. Spread out the wings. Note their position. Note any differences between the two pairs. Which pair would be most useful in flight? Notice the deli- cate lacelike underwings, the supporting veins of which are composed of tubes that carry blood and air. Notice the alDdomen carefully. The most anterior segment is incomplete, and bears an oval structure, the tympanum,
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