476 REVIEWS AND BOOK NOTICES. 
the size of her head (Fig. 129 a1). Thus laden, she clings to the 
top of the pistil, bends her head, thrusts her tongue into the stig- 
matic nectary, and brings the pollen-mass right over its mouth. In 
this position she works with a vigor that would indicate combined 
Fig. 124, 
ia piiiedinn Io male. 
pleasure and purpose—moving her head and body from side to 
side, and apparently making every effort to force the pollen into 
the tube. Such is the method by which our yuccas are fertilized. 
Fig. 125. 
Hyperchiria Io female, 
Riley thinks that the eggs are thrust into the fruit “ from the side 
or from the stigmatic opening, following, most probably, the poem 
of the pollen tubes.” In a day or two after the flowers have with- 
ered the young fruit contains generally two young larvæ. 
A ERA Ge E 2 EEE S E EREE E EAA E RESE AAE S E EAS E EO E 
ERIN AN 
