126 



U.S. NATIONAL MUSEUM BULLETIN 2 55 



Figure 17. — Fruit of Yucca baccata, cross sections, diameters 1.5 and 1.25 in. respectively: 

 Left section (normal) taken below oviposition site; right section taken just above. 



Figure 18. — Fruit of Yucca filifera, longitudinal section, length 3.25 in. (note growth 

 inhibition and ovule abortion at oviposition site). 



