ILLUSTRATIONS. 



Map (Merriam)— 



Figure 1 (Riley) 



Figure 2 " 

 Figure 3 " 



Figure 4 " 

 Figure 5 " 



Figure 6 

 Figure 7 

 Figure S 

 Figure 9 

 Figure 10 

 Figure 11 

 Figure 12 

 Figure 13 

 Figure 14 

 Figure 15 

 Figure 16 



Page 

 -Second provisional bio-geographic map of north 



America, showing the principal hfe areas 60 



—Female Pronuba yuccasella, illustrating the anat- 



omj' and eniljryology 84 



Female Pronuba yucca.-,ella gathering pollen 86 



Flower of Yucca filamentosa with near petals re- 

 moved, showing Pronuba in act of ovipositing. 87 



Transverse section of carpel of Yucca pistil 88 



Longitudinal section of pistil of Yucca filamentosa, 

 showing punctures of Pronuba, deposition of 



eggs, etc 89 



Nectar apparatus of Yucca 91 



Pronuba maculata 92 



Pronuba yuccasella 93 



Mature pods of Yucca angustifoUa 94 



Prodoxus decipiens, imago 96 



Genital characters of Prodoxus decipiens 96 



Prodoxus decipiens, larva, burrows, etc 97 



Prodoxus marglnatus 98 



Prodoxus y inversus 98 



Prodoxus coloradensis 99 



Prodoxus reticulatus, female 99 



(iv) 



