New YorRK AGRICULTURAL EXPERIMENT STATION. 301 
light. With this in mind 20 larve were placed on each of 10 
smooth-skinned apples. Immediately after being infested half of 
the apples were placed on shelves in the laboratory, stem end 
down and half blossom end down. In two days all had settled 
and in every case about three-fourths settled on the under side 
where there was the least light, the remaining one-fourth being 
scattered. 
It is also very noticeable that on infested apple and pear fruits 
-a majority of the young scales will be found grouped about the 
-adults. An examination of a large number of infested fruits, 
including apple, pear, quince, plum and peach, showed about 
eight-tenths of the young scales gathered about the adults that 
had made slight depressions in the fruit, probably as a result 
of sucking the juice and the consequent withering of the tissue, 
while but comparatively few were found about those that had 
not made a depression. A number of typical groups are shown 
much enlarged at Plate XLIX, Figs. 1, 2,3 and 4. At Fig.3a 
male scale is shown with a number of young about it. At Plate 
LI, Fig. 1, a large group is shown, also much magnified. 
Mortality of the larve.—The active larve are very small and 
comparatively delicate, and probably under ordinary conditions 
a large percentage do not succeed in passing the active period. 
To ascertain the mortality among larve kept as near normal con- 
ditions as possible, seven adult females were kept under obser- 
vation for several weeks. They were enclosed in cells like those 
described on page 316. The temperature of the room in which 
they were kept varied from 70° to 75° F. during the day and 
dropped to about 60° at night. The scales were removed from 
three of them. The mortality among the larve from ee 
females is shown in the following table: 
