178 



APHIDES, SCALE INSECTS, ETC. 



successive generations of living young, still allfemales^ 

 some of which are winged, some wingless, go on, until, 

 in autumn, the last generation occurs, which is of 

 males as well as females ; and the females of this, as 

 we said before, instead of producing living young, 

 produce eggs, which start the next year's attack. 



This is a general sketch of the history of the great 

 tribe of Aplddina. This tribe includes the Corn 

 Aphis {A. granaria), which infests the young stems 

 of Corn and the growing Wheat-ears (see Fig. 125) ; 

 the Green Dolphin, as it is called, of the Peas ; the 

 Collier of the Beans (see Fig. 132) ; the Hop Aphis 

 (Fig. 139), which in 1882 caused a loss of more than 

 a, million and a half pounds sterling to this country ; 



Fig. 138.— Turnip Aphides : 1, 2, 5, 6, males ; 3, 4, 7, 8, females ; 

 magnified, and nat. size. 



the Turnip and Cabbage Aphides ; the Black Cherry- 

 tree Aphis ; and many other kinds too numerous to 

 name at present ; besides the white cottony Aphis of 

 the Beech, and the genus known as Pine Aphides, 



