LEGSANDWINGS 73 



The power that gives them their great 

 force is found in certain thoracic muscles 

 that throw the wings into such^^^^l^^ 

 rapid vibrations they are able to 

 play the part of aerial propellers, 



and away goes Vespa, merrily humming as 

 she speeds along. 



In structure and movement the wings 

 of the wasp are similar to those of the 

 bee. 



Like the bee, she has four of them, two 

 on either side of the thorax and attached 

 about half-way from the head to the abdo- 

 men, — attached, one may be sure, at the 

 point best to maintain the balance of the 

 body when it is held suspended in the air. 



The front wing is the larger, and the 

 two are attached close together. 



That these two wings may effectually 

 act as one, they are, like the bee's wings, 

 hooked together. Along the z^:;^";^:— — -^_____ 

 upper edge of the lower <^^^Iir^^^^^^ 

 wing toward its outer mar- ^c_>^ 



