INSECTS [NFE8T1NG THE BEAN. 



335 



CHAPTER CCXXXII. 



The Bean Aphis. (Cal.) . 

 {Aphis ru)iiici><. — Linnteus.) 



Order, Hemiptera; 

 Sub-order, Homoptera 



Famil}', Aphidid.e. 



Fig. 340. 



[Living upon the leaves and stalks of the bean, which they 

 puncture with their beaks and imbibe the sap ; small blackish 

 plant lice.] 



Fig. o4 0. — Bean 

 Aphis ; 1, a stalk in- 

 fested by the aphides ; 

 4, a wingless aphis, 

 enlarged — co lor, 

 blackish ; 3, a winged 

 aphis, enlarged — col- 

 or, black ; 3, natural 

 size of No. S. 



The wingless lice 



(Fig. 340, 4,) are black, 



the head and thorax 



sometimes greenish. 



The winged females (Fig. 840, 2,) are wholly black. In 



England this species is called the " Collier," " Black Dolphin," 



"Black Fly," etc. 



" The bean aphis sometimes appears in such vast numbers as 

 to smother the beans, making them look as if they were coated 

 with soot. The attacks are begun by a few wingless females 

 .estal)lishing themselves near the top of the bean-shoots, where 

 they produce living young. These in their turn are soon able 

 to produce another living generation and so on and on, till 

 the increase is numerous and from the numbers of the ' black 

 fly ' and the sticky juices flowing from the punctures which 

 they have made with their suckers, the plant becomes a mere 

 dirty infested mass, with a few infested leaves sticking out 

 from amongst the plant-lice." — Miss Ormerod. 

 Remedy. — Use Xo. llO. 



