84 



Bilcij — Some Interrclafinu.'t of Pla-nia. and humects. 



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

 puncturing, boring, or sawing instrument for that puri)ose. Tlie 

 generaUzation would be entirely justified, though there are many 

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

 to which our Yucca moth l)elongs. It is, however, necessary to 



'^^^"^</ 



Fro. 1.— A, tip of anal joint and vaginal projection of ^ Pronulia yucca-ella from side, 

 showing ovipositor with parts extended; /;, tiasal joint; c, its tile-like surface; rf, ter- 

 minal joint, with its dorsal serrate wing (/), its dentate tip (<:), its ventral memljranoiis 

 outlet {//), and the extended oviduct (h) ; B, the same parts further enlarged ; C, ventral 

 view of tip of abdomen, slTowing the two pair of rods /, (' and k, k, with their muscular 

 attachments, the parts of the ovipositor similarly lettered as in A: )«, »h. eggs taken 

 from Yueca pistil ; n, egg, showing development of emVn-yon ; o, mature egg from ovary 

 of V ; '■, *', genital claspcrs of o , 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 T wish more par- 

 ticularly to draw your attention. The first is a })air of maxillary 

 tentacles which are jirehensile and spinous on their under surface. 

 They are peculiar to the genus Pronul ta and exist in no other genus 



