27 



THE CHEERY APHIS. 



(Mi/ziis ccrasi. Fabr. ) 



This aphis often causes the leaves of the cherry to become crumpled 

 and rolled, and on young trees sometimes does serious damage. The 

 winged and wingless insects are both of a dark brown color, and look 

 much like the black peach aphis. The eggs are laid in the fall on 

 the branches at the base of buds and in crevices of the bark. The 

 young hatch from them in the spring when the buds begin to swell, 

 crawl out upon the buds and growing leaves, and develop into stem- 

 mothers, which give birth to living young. This is kept up all sum- 

 mer until the fall, when the sexes appear and the female deposits her 

 eggs. A number of winged migrants are developed in the spring 

 generations, which serve to spread the species. The insects usually 

 become very abundant by June, but in midsummer they are not as 



common. 



FAMILY PSYLL,ID.ffi. 



THE PEAR-TREE PSYLLA. 



[Psyllapyricola Forster — fig. 17.) 



This insect is closely related to the plant-lice, but readily known by 

 its longer antennae and its ability to hop. Its color is reddish, with 



Fig. n.—PsyUapyricola; greatly enlarged. (Marlatt.) 



some black markings, and with clear wings laid roof-like over the 

 body. When disturbed, it hops and flies away. 



