116 



Kollar observes of this pest, that though it may be 

 brushed oS, yet it must be with soft brushes ; and care 

 taken not to crush the insects on the plants, as their 

 juice greatly injures the leaves. Brushing them off 

 must either take place at a distance from the hot- 

 house, or they must be killed immediately, otherwise 

 they will creep up on the plants again, as their feet 

 are effective even when they are old. {Kollar.) 



The two former species are undoubtedly o^'iparous ; 

 this seems, on the contrary, to be viviparous. It is 

 most probable that the young ones remain some time 

 in the mealy down of the mother, till they have ac- 

 quired strength, and are arrived to such a degree of 

 perfection as to enable them to support themselves — 

 when they forsake the parent insect, and disperse 

 themselves to different parts of the plant. 



When this species is first perceived on the leaves 

 of the pine, it appears to be nothing more than small 

 particles of meal, or powder, collected together ; but 

 in a few days it assumes the form of a louse or bug, 

 thickly covered with a fine meal or down, of an oval 

 form on its upper, and very flat on its under side, 

 from whence proceed its legs, which are six in num- 

 ber. These, as well as many other particulars in the 

 above description, are not to be distinguished vrithout 

 the help of a magnifying glass. 



This last described species is of a more pernicious 

 nature than the former ; it attacks every part of the 



