172 INSECTS, AND THEIR RELATION TO MAN 



5. RESPIRATION 



Observations. 1. Look for small breathing pores (spiracles) 

 along the sides of the thorax and abdomen. 



2. Examine a spiracle and a tube (trachea) leading from it 

 with the low power of a microscope. 



Conclusion. Describe the breathing organs of an insect. 



Drawing. Side view of an insect with its parts named. 



b. The Butterfly or Moth (a Scale-winged Insect) 



1. GENERAL STUDY 



Observations. 1. How many body regions are there ? 



2. How many pairs of legs ? Of wings ? 



Conclusion. Compare the number of body regions, legs, and 

 wings with those of the grasshopper. 



Observation. Examine a bit of wing under the low power 

 of a microscope, and note the scales which cover the wings. 

 How are these scales arranged ? 



Conclusion. What would happen to the appearance and 

 color of the wings if the scales w r ere rubbed off ? 



Observation. Find the mouth parts. (Use a hand lens or 

 a chart.) 



Conclusions. 1. Are they adapted for sucking or biting ? 



2. Write a sentence giving the likenesses between a butter- 

 fly and a grasshopper. 



3. Write a sentence giving the differences between a butter- 

 fly and a grasshopper. 



2. METAMORPHOSIS 

 I. Tlie Eggs (Optional) 



Observations. 1. Note where and when the eggs of a captive moth 

 are laid. 



2. What are the size and color of the eggs ? 



3. How are the eggs arranged ? 



Conclusions. 1. What does an egg produce when it is hatched ? 

 2. Why are the eggs laid in certain locations ? 



