346 



STATE POMOLOGICAL SOCIETY. 



Fig. i. — a, healthy root ; b, root on which the lice are at work ; c, deserted root where 

 decay has commenced ; d, lice on large roots ; e and/, pupte ; g and A, imagos with wings ; 

 ^■, antenna of same ; /, wingless female on roots depositiag ; k, section of root. 



ment, woiald seem to be to scatter mischief. Without these the lice would 

 seldom spread to other vineyards; with them dispersion is easy and widespread. 



These winged agamic females deposit their eggs on the 

 vines, and from these eggs, which are of two sizes, come 

 the true sexual individuals, the females from the larger, 

 and the males {see Jig. 5 , from the smaller. After pairing 

 Q these true females lay a single egg and perish. Here the 

 cycle is complete. From this single egg hatches a very 

 prolific agamic female, which may remain on the leaves, 

 though more generally she betakes herself to the roots. 

 We see that the individuals keep getting less and less 

 prolific from the first agamic female to the sexual forms 

 which lay but a single agg. 



We see then that the species is continued through the 



winter either as eggs on the roots, — or possibly on the 



Fig. 5.— Male. vines, — or as young or larval lice, domiciled on the 



