ILLUSTRATIONS. 



Page 

 Map (MERRIAM) Second provisional bio-geographic map of north 



America, showing the principal life areas 60 



Figure 1 (RILEY) Female Pronuba yuccasella, illustrating the anat- 

 omy and embryology ^ 84 



Figure 2 " Female Pronuba yuccasella gathering pollen 86 



Figure 3 " Flower of Yucca filamentosa with near petals re- 

 moved, showing Pronuba in act of ovipositing. 87 



Figure 4 " Transverse section of carpel of Yucca pistil 88 



Figure 5 " Longitudinal section of pistil of Yucca filamentosa, 

 showing punctures of Pronuba, deposition of 



eggs, etc 89 



Figure 6 " Nectar apparatus of Yucca 91 



Figure 7 " Pronuba maculata 92 



Figure 8 " Pronuba yuccasella 93 



Figure 9 " Mature pods of Yucca angustifolia 94 



Figure 10 " Prodoxus decipiens, imago 96 



Figure 11 " Genital characters of Prodoxus decipiens 96 



Figure 12 " Prodoxus decipiens, larva, burrows, etc 97 



Figure 13 " Prodoxus marginatus 98 



Figure 14 " Prodoxus y-inversus 98 



Figure 15 " Prodoxus coloradensis 99 



Figure 16 " Prodoxus reticulatus, female 99 



