. Adventures with animals and plants. Biology. Fui. 68 The black widow spider 7J?agnified. ]Vith legs stretched otit it is ctbout one and one half inches in size. The lower side of the abdo- men with its distinct hour- glass is shown at the nppcr right. At the lower right cor- ner is the body of the n/ale. How does it compare in size with the female';' (v. s. DEPARTMENT OF AGRICULTURE) w (jndered what was meant by the "quiet" of the countryside. The sound-producing apparatus of the cricket is peculiar. The front pair of wings is thickened. The edges of the wing covers have a set of &
. Adventures with animals and plants. Biology. Fui. 68 The black widow spider 7J?agnified. ]Vith legs stretched otit it is ctbout one and one half inches in size. The lower side of the abdo- men with its distinct hour- glass is shown at the nppcr right. At the lower right cor- ner is the body of the n/ale. How does it compare in size with the female';' (v. s. DEPARTMENT OF AGRICULTURE) w (jndered what was meant by the "quiet" of the countryside. The sound-producing apparatus of the cricket is peculiar. The front pair of wings is thickened. The edges of the wing covers have a set of "; As one roug^h surface rubs over the other the stiff winos vibrate. It is the vibration that is heard as a shrill chirping. In katydids and cicadas the apparatus is slightly different. In these insects it is only the males that are so equipped. Other insects, such as bees and flies, make noise by the rapid beating of their w inos. The insects. So numerous and so varied are the insects that many books have been filled with accounts of their extraor- dinary structure and fascinating lives. This brief account has onlv scratched the surface. Tlie biologists who study insects (called entomologists, en-toh- niol'o-jists) can tell man\' excitinu^ tales of the doings in the highh' populated insect world. For review do Exer- cise 3. Other arthropods — the spiders. If you turn again to the chart on page 41 vou will see that besides the very laroe and varied class of insects there are three other classes in the arthropod phylum. One of them is the spiders and their close relativ^es. Does it astonish you to learn that spiders arc not insects? It should not. Being arthropods, of course, they have a firm outer covering and jointed legs; but ^'ou \x\\\ count four pairs of legs (not three), and only two body parts. The head and thorax are joined together. And x\\q\ lack three structures found in insects: ^ings, antennae, and compound eyes. Now draw the diagram suggested in E
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Keywords: ., bookcentury1900, bookpublisherbostondcheath, booksubjectbiology
