188 



APHIDES, SCALE INSECTS, ETC. 



iind therefore famigation can be brought to bear. 

 But the prmciple throughout appears to be this: — 

 Check attack by diminishing lurking-places, and also 

 by pruning off and destroying infested shoots and 

 parts of plants, or infested leaves (as with Cabbage), 

 as much as you can ; and where you can bring washes 

 to bear, use soft-soap as a foundation ; but where the 

 application may be run into the ground, and thus 

 remain round the insects, ammoniacal water, or 

 drainings from stables, lime-water, or other drenchings 

 poisonous to insect-life, and that will not hurt the 

 2)lant, have proved useful. 



Fig. 144. — Ahywdea proJctella : Fly and pupa, much magnified ; 

 Flies on leaf, twice nat. size. 



Tlie third familji of the section Dimera of the Homop- 

 tera contains the Aleijrodidce. These are not the cause 

 of any very great amount of mischief, but they require 

 mention on account of their peculiar difference, in 

 larval and pupal condition, from that of the imago. 

 Thus in the characteristics which are most observable, 

 without minute inspection, they differ from most of 

 the other divisions of this order, excepting the Scale 

 insects, qv Coccidce, to which they bear many re- 

 semblances. 



This A.proletella is a small four- winged Fly, very 



