A/r. CuRTis*s Ohfer'vatiom on Aphideu 91 



Aphides^ while at their higheft point of multiplication, do not fwarm 

 like bees or ants, and fly offer emigrate in large bodies; but each 

 male or female Aphh^ at fuch periods as they arrive at maturity, 

 marches or flies off without waiting for any other. Yet it may 

 happen that, from a tree or plant thickly befetwith them, numbers 

 may fly off or emigrate together, being arrived at maturity at the 

 fame moment of time. 



Detaching itfelf from the plant, each purfues a diflferent route, 

 intent on the great bufmefs of multiplying its fpccles ; and fettles on 

 fuch plants in the vicinity as are calculated to afford nourilhment 

 to its young. 



The common green Aphis ^ which is fo generally deflruclive, lives 

 during the winter feafon on fuch herbaceous plants as it remained 

 on during the autumn, cither in its egg or perfect flate. If the 

 weather be mild, it multiplies greatly on fuch herbage; as the fpriuor 

 advances, in May the males and females of thcle infccis accjuirc 

 wings : and thus the bufmefs of increalL', hitherto confined, is widely 

 and rapidly extended, as the winged Aphides^ by hop- planters called 

 the Fly, may be feen from this period very generally fitting on plants, 

 and floating in the air in all direclions. 



Minutes of Appearances obfcrved in the Aphis falicis from the End of 

 '- September to December 6tk. 



The Aphis falicis is among the largefl: Englllli fpecies, and is found 

 on the bark both of the trunk and branches of the Salix triandra^ 

 fragilis^ and ^chmnalis^ but mofl abundantly on the laft. The 

 bodies of thefe infe6ts contain a red liquid, and hence performs em- 

 ployed in ftripping ofiers have their hands rendered ajiparently 

 bloody by unavoidably bruifmg them. 



Near the end of September multitudes of the full grown infecls 

 of this fpecies, both winged and others, are obfervcd to defert the 



" N 2 willows 



