lO 



THE POPULAR SCIENCE MONTHLY. 



wherein it shows the affinity of the species to the Coccidce^ the females 

 of which, as they mature, generally lose all trace of the members they 

 possessed when born. 



The second or more oval form (Fig. 4, e) is destined to become 

 winged. Its tubercles, when once acquired, are always conspicuous ; 



Fig. 5. 



Type Radicicola.— a. shows a healthy root; 5, one on which the lice are working, representing the 

 knots and swellings caused by their punctures : <?, a root that has been deserted by them, and 

 where the rootlets have commenced to decay; (?, d, (Z, show how the lice are found on the 

 larger roots; e, female pupa, dorsal view;/, same, ventral view; g', winged female, dorsal 

 view; A, same, ventral view; i, magnified antenna of winged insect; .;, side view of the wing- 

 less female, laying eggs on roots; A;, shows how the punctures of the lice cause the larger roots 

 to rot. 



it is more active than the other, and its eyes increase rather than di- 

 minish in complexity with age. From the time it is one-third grown, 

 the little dusky wing-pads may be discovered, though less conspicuous 

 than in the pupa state, which is soon after assumed. The pupae (Fig. 

 5, e,/) are still more active, and, after feeding a short time, they make 



