THE YELLOW CLOVER APHIS. 



21 



WINGED VIVIPAROUS FEMALE. 



(Fig. 11.) 



General color of body pale yellowish green, with dusky tuberculate 

 areas more or less uniformly placed on the dorsum. Capitate hairs 

 aufl tul)ercles not so prominent as in the apterous forms. Head 

 bearing three capitate hairs, more or less in a row on each side of the 

 median dorsum, an additional one on each side, near the posterior 

 margin, and a pair projecting from the front, one on each side of the 



median ocellus. 



Prothorax with two similar hairs near the posterior 



The thoracic plate 



margin and an additional one on each side. 



Fig. 11.— The yellow clover aphis {Callipterus trifolii): Winged viviparous female, much enlarged 

 a. Antenna of same; 6, cornicle of same; c. end of abdomen and cauda of same, lateral view; d, cauda 

 and anal plate of same in natural position; e, cauda of same, depressed, showing its full length, 

 a-f, Greatly enlarged. (Original.) ' 



bears numerous minute pits or clear circular areas, some of which 

 bear hairs. Abdomen with a row of coalesced tuberculate dusky 

 areas, each area usually bearing two capitate hairs, as describt^d 

 for the stem-mother, and a longitudinal row of dusky tuberculate 

 areas, each area smaller than those just mentioned and each bearing 

 but a single hair. On the margins, and often projecting from its 

 body, thus giving the border the appearance of being coarsely 

 dentate, are rows of setse bearing tuberculate areas, one row on each 

 side. Although there is some slight variation in the position of the 

 hail's and maculations, and the maculations on the abdomen also 

 vary more or less in shape and size, the foregoing is the usual arrange- 

 ment. 



48306° -14 2 



