EXPLANATION OF PLATE XXIV. 
Aphis medicaginis, Koch, p. 203. 
FIG. 1.—Alate female (after Essig). 
»  2.—Apterous female, American form (after Essig). 
» _3-—Apterous viviparous female. 
,  4.-—Antenna of alate female. 
Aphis nerii (Boyer de Fonscolombe), p. 204. 
FIG. 5.—Alate viviparous female. 
»  06.—Apterous viviparous female. 
»  7.—Antenna of alate female. 
Aphis sacchari (Zehntner), p. 206. 
Fic. 8.—Alate female. 
»  9.—Apterous female, yellow variety. 
», 10.—Apterous female, pink variety. 
», ıı.— Antenna of alate female. 
„ 12.—Cauda and cornicle of alate female. 
