THE DOCK FALSE-WORM. 



31 



instars. Wlien this was first suspected several larvae were being 

 reared on a single plant, and while the molted skin was always 

 removed from the leaf when the record of molting was made, there 

 was some doubt as to whether any of the larvse actually did pass an 

 extra molt. Subsequently, however, the majority of larvas were 

 reared singly, that is, only one to a plant, and several apparently 



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Fig. 6 _The 'lock false-worm: Diagram illustrating seasonal history. (Original.) 



definite records of an extra molt were obtained. These records, while 

 not sufficiently numerous to furnish absolute proof of the occasional 

 occurrence of this additional molt, are given in Table XXII. Indi- 

 vidual No. 4 was from an unfertilized egg; the others were from 

 fertile eggs. 



Table XXII — Records oflarvx of the dock false-worm having seven instars, Wenatchee, 



Wash., 1915. 



1 



c 

 a 



l >a1 of— 



CV- 



Uatch- 



1 ir 1 



Second 



Third 



Fourth 



Fifth 



Sixth 



Pupa- 



Emer- 



hS 



t 



ing. 



molt. 



molt. 



molt. 



molt. 



molt. 



molt. 



tion. 



gence. 



1 



1st 



June 29 



July 1 



July 8 



July 11 



July 15 



July 10 



July 20 



Aug. 1 





2 





July 3 



July 5 



So... 



.do.... 



July 11 



.do..... 



July 22 



July 29 



Aug 



3 



••', 





...do 



July 7 



July 9 



...do 



July 13 



July 17 



July 21 









4 



1 1 



July 4 



...do 



...do 



...do 



July It 



...<lo 



July 1!) 









5 



3d 



July 2* 



July 31 



Aur. 2 



Aug. 1 



Aug. 10 



Aug. 12 



Aug. 17 









n 



:M 



Aug. 4 



Aug. 7 



Aug, 10 



All!'. 11 



Aug. 15 



Aug. L9 



Aug. 23 









7 



M 



do 



do... 



.do.... 



Aug. 13 



do 



. .do 



Aug. 21 









R 



4th 



A iif. 20 



Aug. 27 



AiH'. 29 



Sept. 1 



Sept. 4 



Sept. 9 



Sept. 21 









'< 



in. 



do 



Aug. 30 



: apt. 'i 



Sept. 16 



Sept. 19 



Sept. 21 



Oct. 3 









10 



nil 



A u;;. 27 



Aug. 29 





Sept. 1 



. ept. in 



Sept. 10 



Sept. 22 







