INSECTICIDES ON GARDEN AND GREENHOUSE PESTS. 747 



This coccid is one of the smallest of its tribe, measuring only ^V, to of 

 an inch in length. By boiling specimens in caustic potash the true 

 character of the insect may be seen under a good microscope. The 



Fig. 314. — Subterranean Mealy Bug {Rijjersia terrestris, Newst.) on Roots 



OF Adiantum (nat. size). 



horns (antennae) are elbowed or bent backw?«rds to enable the insect the 

 more readily to burrow or move about in the narrow passages of its 

 habitat. The legs are well formed, and there is a very strong muscle or 

 lever-like organ attached to the front pair of legs which no doubt gives 



