OP THE FAEM AKD GAKDEK. 



191 



greatest injury in its under-ground life, sucking the juices 

 of the roots of trees and plants, where it lives seventeen 

 years. It however does much injury to fruit and other 

 trees; the excavations made by the female form bad, 

 ragged wounds, and sometimes so weaken the small 

 branches that they are broken oH. The following is 

 mainly condensed from the description by Harris in his 

 work on "Insects Injurious to Vegetation.''* 



The Seventeen-year Cicada in the winged state (fig. 

 118, c), is of a black color, with transparent wings and 



Fig. 118— PERIODIC AX CICADA. {Cicada septendecim, Linn.) 



a, Pupa ; 6, Pupa Shell ; c, Perfect Insect ; d, Twig with Punctures, natural size ; 

 e, Eggs, enlarged. 



wing-covers, the thick anterior edge and larger veins of 

 which are orange-red, and near the tips of the latter 

 there is a dusky zigzag line in the form of the letter W, 

 supposed by the superstitious to indicate war ; the 

 eyes when living are also red; the rings of the body 

 are edged with dull-orange; and the legs are of the same 



