118 



PAPEES ON CEREAL AND FORAGE INSECTS. 



At many of the towns visited neither species was found, although 

 their food plants were plentiful. If these two forms were con- 

 sidered to be one species these results would be very difficult to 

 explain. 



At Salisbury, N. C, a colony of these aphides on Aster subulatus 

 was found parasitized by a species of the hymenopterous genus 

 Lysiphlebus. This colony was at the crown of the plant near the 

 surface of the ground. 



