142 QUINCE CULTURE. 
differs from the oyster-shell bark louse by being nearly 
round, or slightly elongated and irregular. It is flat, 
and when fully grown 
A lis about one-eighth of 
; 2 oe an inch across. The 
middle of each scale is 
marked with a black 
or yellowish point 
slightly elongated. 
yf | When crushed a yel- 
i pase) lowish, oily liquid ap- 
Ma ait pears on the bark, 
: = often changed to a 
purplish color. Young 
scales are darker than 
Fig. 132. ADULT FEMALE conTarnrnc When older and larger, 
YOUNG. and look black, while 
those still younger are yellowish. A section of pear 
stem is shown in Fig. 130, covered with the San Jose 
4} 
Sey la a 
Sy . 
M4 
LFF. es 
Fig. 133. ADULT MALE INSECT. 
