1 62 



^GY. 



this larva moults, rapidly increases in size, and soon commences lay- 

 in*; In due time inve birth t> voting, which s 



:ng mothers, like- the first ; and, like them, 

 emain winkle--. Five :is of these parthen- 



16 Phylloxera, root-inhabiting form, a shows a healthy root ; , one on which the lice are 

 iK. representing tlie knots and s\Nellink'S caused by their punctures; r, a root that has 

 been deserted by them, anil where the t ,/. ,/, ,/. shows how 



the lice arc found on the lar^r- nyin|)h. dotsal vii-w ; /, same, ventral \ 



' (1 female, dorsal view ; .:r.il view : /. ma^mtied antenna of winded in 



: the winjil'- -'Vinff ejfjjs on nx.ts ; k shows how the punctures of the lice 



' the larger .cy.) 



;^-l)cann^, windless mothers follow each other, when 

 (about the middle of July, in the latitude of St. Louis) some of 

 the individuals be^in to acquire win^s. Thus is ])roduccd the second. 

 or mi^ratin ic, winded form i ' I-'i^. i.^'i. The>e issue from 



the jrnjund while yet in the pupa state' ; as soon as they hav< 



