ATTACKING THE BRANCHES. 



203 



FIG. 209. 



ATTACKING THE BBANOHES, 



No. 106. The Dog-day Cicada. 



Cicada tibicen Linn. 



In appearance this insect very much resembles the seven- 

 teen-year locust, No. 15, but differs from it by occurring in 

 more or less abundance every year during the months of 

 August and September, when it sometimes wounds the small 

 limbs of the cherry and deposits its eggs therein. The body 

 is black on the upper side, the head and thorax being spotted 

 and marked with olive-green. The wings are large, trans- 

 parent, and strongly veined, the principal veins having a 

 greenish tint. The under side of the 

 body is coated with a whitish powder, 

 legs greenish. This cicada, which is 

 shown in Fig. 209, is very generally 

 distributed throughout the Northern 

 United States and the province of 

 Ontario, and the shrill notes of the 

 males may be heard almost everywhere 

 during warm days in August, from ten 

 o'clock in the morning until two in 

 the afternoon. The males only are 

 musical, and their drums are situated 

 in cavities in the sides of the anterior 

 segments of their robust bodies. 



The larva is unknown, but doubtless closely resembles that 

 of the seventeen-year locust ; the pupa also is very similar, and 

 has been found beneath cherry, maple, and elm trees. The 

 ravages of this insect have never been sufficiently important 

 to attract much attention. 



No. 107. The Cherry-tree Bark-louse. 



Lecanium cerasifex Fitch. 



This is a bark-louse very much resembling that of the 

 pear-tree, Lecanium pyri, No. 69. It may be found in 



