Entomological Division. 



429 



The appearance of tlie insect. — Tlie pest appears in two forms, 

 the more common form without wings (Fig. 1), and a form oecMr- 

 ring in limited numbers provided four ample wings (Fig. 3). The 

 adult wingless insect is a little less than one tenth of an inch 

 in length and of a dark shining brownishlblack color with por- 

 tions of the legs yellowish. Figure 1 shows the shape and general 



Figure 1 . — Wingless viviparous female. 



appearance of the wingless form; the hair line at the right 

 represents the natural length of the body. Two -very short 

 tubercules called honey-tubes project from the caudal end of the 

 abdomen. The beak lies along the breast of tlie insect when at 

 rest, but when feeding it is placed against the leaf at right angles 

 to the body, and four fine bristles moving in a groove of the beak 



Figure 2.— Winged viviparous female. (After J. B. Smith.) 



are forced into the tissues and the sap is pumped through this 

 apparatus into the body. 



The adult winged forms have the long transparent wings carried 

 roof-like over the sides of the body when at rest. These forms 

 also differ from the wingless ones in being slightly longer and 

 more slender, and in having longer antennae and honey-tubes, as 



