34 
BULLETIN 885, TJ. S. DEPARTMENT OF AGRICULTURE. 
In this instar (PL VIII, B) sexes can be distinguished with cer- 
tainty for the first time in the developmental stages, the males being 
at least one-third smaller than the females. The only complication 
in distinguishing the sexes seems to be between males and undersized 
females, although the latter are somewhat larger than the former. 
The duration of the third larval instar is from 6 to 20 days, although 
out of doors the majority of individuals molt a third time between 
the eighth and fourteenth days after the second molt. 
No color change has been observed in the third larval instar indi- 
viduals preceding the third molt except that the dorsal hemispherical 
Dorsal View Lateral View 
Time 8 A.M. 
Lateral View 
Time 9:18 A.M. 
Dorsal View 
Time 9: 
Doreal View 
Time 9:26 A.M. 
Fig. 7.— Diagrammatic drawings of the molting of Aleurocanthus woglumi: Third molt. 
spot often becomes a lighter green and the whitish margin becomes 
very pronounced from one to four hours preceding the actual molting 
of the individual. Careful study of this has been made and appears 
to be due to the distention of the insect which permits the individual 
beneath to show through. 
Of the individuals with which the writers worked, 38 out of 306, or 
almost 12.5 per cent, died. 
FOURTH INSTAR OR PUPA. 
The third molt takes place very rapidly, the entire process being 
completed in 15 minutes. (See fig. 7.) The individuals are pale 
cream-colored, fiat, and the marginal teeth are not visible immediately 
