. Beginners' Zoology . Is the skeleton as stiff and thickas that of a crayfish .? What is the fig. io6. —a grass-length of your specimen? Its colour? hopper. Why does it have this coloration ? In what ways does thegrasshopper resemble the crayfish? Differ from it? The Three Regions of the Body.—The body of the grass-hopper is divided into three regions—the head, the thorax,and the abdomen. Which of these three civisions has no dis-tinct subdivisions? The bodyof earthworm, is made of ringlike segments. Are the seg-ments most distinct in the head, the thorax or the a
. Beginners' Zoology . Is the skeleton as stiff and thickas that of a crayfish .? What is the fig. io6. —a grass-length of your specimen? Its colour? hopper. Why does it have this coloration ? In what ways does thegrasshopper resemble the crayfish? Differ from it? The Three Regions of the Body.—The body of the grass-hopper is divided into three regions—the head, the thorax,and the abdomen. Which of these three civisions has no dis-tinct subdivisions? The bodyof earthworm, is made of ringlike segments. Are the seg-ments most distinct in the head, the thorax or the abdomen ?Which region is longest ? Shortest ? Strongest ? Why ?Which region bears the chief sense organs ? The ap-pendages for taking food ? The locomotory appendages ?Which division of the body is most active in breathing ? 63. 64 BEGINNERS ZOOLOGY 2=mC- The Abdomen. — About how many segments or rings in^the abdomen ? Do all grasshoppers have the same num-ber of rings ? (Answer for different species and differentindividuals of the same species.) The first segment andthe last two are incomplete rings. Does the flexibility ofthe abdomen reside in the rings or in the joints between therings ? Is there merely a thin, soft line between the rings,or is there a fold of the covering? Does one ring slip intothe ring before it or behind it when the abdomen is bent ?As the grasshopper breathes, does each ring enlargeand diminish in size ? Each ring is divided into two partsby folds. Does the upper half-ringoverlap the lower half-ring, or thereverse .-* With magnifying glass, finda small slit, called a spirachy or breath-ing hole, on each side of each ring justabove the side groove (Fig. io6). Atube leads from each spiracle. Whilethe air is being taken in, do the twoportions of the rings move fartherapart .?* When t
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