A SYNOPSIS OF THE APHIDIDAE 177 



Wheat, see Triticum 

 Willow, see Salix 

 Yarrow, see Achillea 

 Yucca (yucca) 



151. Aphis yuccae Cowen 

 Zantedeschia (calla) 



88. Myzus circumflexus (Buckton) 

 Zea (corn) 



111. Aphis avenae Fabr. 



128. Aphis maidis Fitch 

 Zizia 



155. Siphocoryne capreae (Fabr.) 



