118 ELEMENTARY STUDIES IN INSECT LIFE 



Were the total consumption of seed the rule, it is evi- 

 dent the plant would soon become extinct, and with it 

 the Pronuba moth. Such is not the case; the elongate 

 ovaries bear many ovules, more than the larvae enter- 

 tained will in all probability consume, and so enough 

 seeds are left unharmed to insure the continuation of 

 the yucca lily seeds, which will in turn arise to make 

 possible the further existence of the interesting little 

 Pronuba moths. 



