466 



Transactions. 



The Cocoon. 



The cocoon is constructed within the terminal part of the niine, either 

 close alongside the midrib or on the outer margin of the leaf. It is slightly 

 deeper in the substance of the • leaf than the rest of the mine. It is 

 cylindrical in shape and slightly curved. The scanty silken lining causes 

 a local pinching and puckering of the leaf, and raises the cuticle above the 

 surface of the leaf. It bears a small white almost transparent window 

 at one end, prepared for the pupal emergence. Its position is generally in 

 the basal half of the leaf. Size, 12 mm. by 3 mm. 



The Pwpa. 



Closely resembles the pupa of the Panax moths in all particulars, 

 cephalic plate is moderate in length, but fairly 



massive 



The 

 the lateral 



3! oz 



Fig. 31. — Pupa of P. panacivagans, ventral view. 

 Fig. 32. — Dorsal view. 

 Fig. 33. — Lateral view. 



cornua are about equal in length to the plate. Prothorax broad against 

 the antennae, but is lost in the mid-dorsal region. Setae exactly as in 

 P. panacitorsens ; the lateral setae are relatively long. 



Chief Measurements of Pupa. 



Dehiscence. 



This takes place on the upper surface of the leaf and is identical in all 

 respects with that of the Panax moths. 



