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NEW YORK STATE MUSEUM 



its recognition by those not acquainted with it, the following figures 

 are given: 



At a the pupa is shown. This is the form that the larva assumes as 

 it approaches maturity in its sixteenth or seventeenth year, and is that 

 in which it comes out of the ground in May or June and climbs up 

 and fastens itself by its sharp claws to the trunk of a tree, shrub, 

 fence or some other convenient upright object. In a short time the 

 pupa-case (the outer horny covering of the pupa) splits on its back 

 and the mature insect (in a white color at first) comes out of it, leav- 

 ing it as seen at b. When the wings have expanded and dried and 

 the insect has changed to its natural colors of red eyes and red veins 



of the wings, it is ready for flight, as represented at c. At d is 

 intended to be shown the slits bored into the twigs for its eggs (two 



