122 



ORDER HEMIPTERA 



relative length and number of joints, location of sensoria 

 in the honey tubes or nectaries, and the anal style. 



Fig. 75. — Spring grain aphis {Toxoptera graminum): male, greatly 

 enlarged. (From Webster, Div. Ent., U. S. Dept. Ag.) 



Pea Aphis. — The pea aphis is a species Avhich occasionally 

 multiples to an enormous extent and causes heayy losses 



Fig. 76. — Spring grain aphis {Toxoptera graminum) : egg-laying female 

 with eggs in body, greatly enlarged. (From Webster, Div. Ent., U. S. 

 Dep. Ag.) 



in the pea crop. Another yery destructiye species at times 

 is the one affecting melons. 



