84 RileySome' ////o-;v7"//o//.y <>f Plants and Insects. 



tera as a rule secrete theirs, and are furnished with either a 

 puncturing, boring, or sawing instrument for that purpose. The 

 generalization would be entirely justified, though there are many 

 curious exceptions to it, especially in the very group Tineina, 

 to which our Yucca moth belongs. It is, however, necessary to 



Fro. 1. A, tip of anal joint and vaginal projection of < Pronuba j/ucca*ella from side, 

 showing ovipositor with parts extended: h, basal joint; c, its tile-like surface: <1, ter- 

 minal joint, with its dorsal serrate wing (/), its dentate tip (e), its ventral mem 

 outlet (</), and the extended oviduct (It) ; B, the same parts further enlarged : ( ', 

 view of tip of abdomen, showing the two pair of rods i, i and A:, A, with their m 

 attachments, the parts of the ovipositor similarly lettered as in A: M, fH, e 

 from Yucca pistil ; it, egg, showing development of embryon ; o. mature CULT i 

 of Q ; r, s, genital claspers of (5\ lateral and dorsal view -all enlarged. 



state these general truths in order to convey a just idea of the 

 exceptional nature of the two organs to which I wish more par- 

 ticularly to draw your attention. The first is a pair of maxillary 

 tentacles which are prehensile and spinmis on their under surface. 

 They are peculiar to the genus Pronubaand exist in no other genus 



