128 



^yV economic entomology. 



for their distribution. As they never come to the surface, so far 

 as we know, they are never winged, and are usually dull white 

 in color, or with a slight tinge of green. The body is covered 

 with a whitish powder and lacks honey-tubes. 



Fig. 94. 



Phylloxera vastatrix. — a. unaffected rootlet of grape ; b, rootlets with newly-tormed 

 galls; c, same, with old and dried-up tissue; dd, groups of the lice on roots and root- 

 lets ; <?,y, female pupa, from above and below ; g, h, winged females ; i, an antenna ; j, 

 oviparous wingless female and her eggs ; k, root showing location of the eggs. 



An advance upon those root-living species is found in Phyl- 

 loxera, which belongs with Chcrmes in a sub-family, Chermesina, 



