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lour again arise from joint 3, the previous four being thus push- 

 ed forward, the original 4th joint now becomes the 12th. At 

 the third ecdysis only three additional joints are gained, and at 

 the fourth (last) only one, so that the original 4th now becomes 

 the I 6th. 



It is possible that the adult insect sometimes possesses more 

 than twenty joints, but that appears to be the maximum, out of 

 a large series that were examined. 



