CHAPTER III. 



INSECTA (Continue^. 



THE CRICKET. 



1. In what respects are the cricket and grasshopper alike? 



2. In what respects do they differ? 



3. The female cricket has a long, slender ovipositor. Compare 

 its parts with the parts of the grasshopper's ovipositor, picking 

 them apart with a dissecting needle. Use a lens. 



4. A pair of tapering, jointed projections from the abdomen 

 are the stylets. Of what use are the stylets ? 



5. Compare the wings of the male and female. Look on the 

 under surface of the outer wings of the male for a vein, running 

 crosswise, near the anterior end, which has on it a row of teeth. 

 By rubbing this file on the veins of the other wing, the cricket 

 makes its chirping noise. Watch crickets to see how the wings 

 are managed during this process. 



6. With a lens look for the so-called hearing organ on the tibia 

 of each fore leg. 



7. Make a drawing showing all that can be seen from above 

 (dorsal view), and name all the parts shown.. 



Grasshoppers and crickets belong to the order of insects called 

 Orthoptera, or straight-winged insects. 



THE DRAGON FLY. 



1. Compare the shape and relative size of the parts of body 

 with those of other insects. In some dragon flies the eyes have 

 as many as 12,500 facets each. 



2. What kind of mouth parts has the dragon fly? 



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