THE DOCK FALSE-WORM. 



31 



instars. When 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 larvae actually did pass an 

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

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



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-The dock 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. 



•s o 

 d 



Date of— 



Hatch- 

 ing. 



First 

 molt. 



Second 

 molt. 



Third 

 molt. 



Fourth 

 molt. 



Fifth 

 molt. 



Sixth 

 molt. 



Pupa- 

 tion. 



Emer- 

 gence. 



1st. 

 1st. 

 1st. 

 1st. 

 3d. 

 3d. 

 3d . 

 4th 

 4th 

 4th 



June 29 

 July 3 

 ...do.... 

 July 4 

 July 28 

 Aug. 4 



...do 



Aug. 26 

 ...do.... 

 Aug. 27 



July 1 

 July 5 

 July 7 



..do 



July 31 

 Aug. 7 



..do 



Aug. 27 

 Aug. 30 

 Aug. 29 



July 8 

 ...do.... 

 July 9 



...do 



Aug. 2 

 Aug. 10 



...do 



Aug. 29 

 Sept. 9 

 Aug. 31 



July 11 



...do 



...do 



...do 



Aug. 4 

 Aug. 11 

 Aug. 13 

 Sept. 1 

 Sept. 16 

 Sept. 4 



July 15 

 July 14 

 July 13 

 July 14 

 Aug. 10 

 Aug. 15 



..do 



Sept. 4 

 Sept. 19 

 Sept. 10 



July 19 



...do 



July 17 



...do 



Aug. 12 

 Aug. 19 



...do 



Sept. 9 

 Sept. 21 

 Sept. 16 



July 26 

 July 22 

 July 21 

 July 19 

 Aug. 17 

 Aug. 23 

 Aug. 21 

 Sept. 21 

 Oct. 3 

 Sept. 22 



Aug. 1 

 July 29 



Aug. 3 



