. Beginners' Zoology . Fig. 109. — How a Grasshopper Fig. iio. — How a Spider Walks. Walks. body, which joint of the leg is the largest — the first, sec-ond, third, or fourth ? Which joint is the shortest? Theslenderest? Which joint has a number of sharp points orspines on it ? Find by experiment whether these spinesare of use in walking (Fig. 106). Jumping. what order are the legs used in walking ? How manylegs support the body at each step ? All animals that have ears have ways of communicatingby sounds. Why would it be impossible for the grasshop-per to have a voice, even if it
. Beginners' Zoology . Fig. 109. — How a Grasshopper Fig. iio. — How a Spider Walks. Walks. body, which joint of the leg is the largest — the first, sec-ond, third, or fourth ? Which joint is the shortest? Theslenderest? Which joint has a number of sharp points orspines on it ? Find by experiment whether these spinesare of use in walking (Fig. 106). Jumping. what order are the legs used in walking ? How manylegs support the body at each step ? All animals that have ears have ways of communicatingby sounds. Why would it be impossible for the grasshop-per to have a voice, even if it had vocal cords in itsthroat? The male grasshoppers of many species make achirping, or stridulation, by rubbing the wing against theleg. Look on the inner side (why not outer side ?) of the INSECTS 67. Fig. III. — A, Row ofSpines, z, used inchirping. B, the same more enlarged largest joint of the hind leg for a row of small spines visi-ble with the aid of a hand lens (Fig. in). The sound isproduced by the outer wings rubbing against the you noticed whether the sound isproduced while the insect is still or inmotion .? Why } The male grasshop-pers of some species, instead of havingspines, rub the under side of the frontwing on the upper side of the hind —To what is the first pairof wings attached. The second are the wings not attached to theprothorax .?* Why are the wings attachedso near the dorsal line of the body} Why are the secondand third rings of the thorax more solidly joined than thefirst and second rings} Compare the first and second pairs of wings in shape,size, colour, thickness, and use (Fig. 112). How are the second wings folded so as to gounder the first Abouthow many folds in each }Draw a hind wing opened What is
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