22 ANIMAL BIOLOGY 



held its own in those countries, becoming of great importance in 

 Italy. . . . Japan to-day produces a very considerable proportion 

 of the world's supply of raw silk. Thus of the $41,000,000 spent 

 by the United States for raw silk in 1902, more than $20,000,000 

 went to Japan." l Many attempts have been made to introduce 

 this industry into the United States, but the experiments thus far 

 made have been rather unsuccessful. 



II. GRASSHOPPERS AND THEIR RELATIVES 

 20. Study of the grasshopper. Laboratory study. 



A. Regions and appendages. Examine a grasshopper and 



distinguish the three regions of the body proper : 



(1) the front or anterior region called the head; 



(2) the middle region called the thorax; and 



(3) the hind or posterior region known as the ab- 

 domen. (The anterior region of the thorax is 

 covered by a cape or collar.) 



1. Which region is the smallest? Which is the widest? 



Which region is the longest ? 



2. Which region has legs and wings attached to it? 



3. Which region is made up of a number of similar rings 



or segments? 



B. Organs of the head; feeding. 



1. Notice two long, slender feelers on the head. They 



are known as antennce (singular, antenna). State 

 the position of the antennae on the head and de- 

 scribe their shape. 



2. Describe the shape and position of the large eyes. 



State their relative size compared to that of the 

 head. 



3. (Optional.) Cut off with a sharp knife a thin slice from the 



outer surface of one of the large eyes. Remove all 

 the soft, dark material from the inside. Place the 



1 Bailey's Cyclopedia of Agriculture, Vol. Ill, p. 640. 



