THE DOCK FALSE-WORM. 



27 



Life cycle and emergence, of adults of third generation. — Since all but 

 one of the third-brood larvae reared to the adult stage came from eggs 

 collected in the field, it is not possible to give a complete life cycle of 

 this generation. Table XVI gives a partial life cycle (omitting the 

 egg stage) of 5 males and 5 females. 



Table XVI. — Length of partial life cycle ofthe third generation of the dock false-worm, 



Wenatchee, Wash., 1915. 



Males. 



Indi- 



Aidual 

 No. 



Date of— 



Days in- 



Total 

 life 



cycle 

 in 



days. 



Hatch- 

 ing. 



Pupa- 

 tion. 



Emer- 

 gence. 



Larval 

 stage. 



Pupal 

 stage. 



1 



2 

 3 

 4 

 5 



July 25 

 July 28 

 Aug. 1 

 Aug. 17 

 ...do 



Aug. 12 

 Aug, 13 



Aug. 17 

 Aug. 18 

 Aug. 22 

 Sept. 8 

 Sept. 9 



18 

 16 



5 

 5 



23 

 21 

 21 

 22 

 23 



Sept. 3 

 ...do 



17 

 17 



5 

 6 



Tol 





68 

 17 



21 

 5.2 



110 



22 









Maximum life cycle, 23 day 



s; minimu 



m, 21 days. 



Females. 



1 

 2 

 3 

 4 

 5 



July 25 

 ...do 



July 28 

 ...do 



Aug. 11 



Aug. 12 

 Aug. 13 

 Aug. 14 

 Aug. 15 

 Aug. 26 



Aug. 17 

 ...do 



Aug. 18 

 Aug. 19 

 Aug. 30 



•18 

 19 

 17 

 18 

 15 



5 



4 

 4 

 4 

 4 



23 

 23 

 21 

 22 

 19 



Tot 



al 



87 

 17.4 



21 

 4.2 



108 

 21.6 



Av 







Maxirr 



mm life cy 



cle, 23 day 



3; minimui 



n, 19 daj 



TS. 



As Table XVI is very incomplete, the length of the complete aver- 

 age life cycle has been compiled from separate results obtained for 

 the various stages and is given in Table XVII. 



Table XVII. — Average length of complete life cycle of the third generation of the dock 

 false-worm, as compiled from the various stages, Wenatchee, Wash., 1915. 



Number of days in— 



Total 



life 



cycle 



in days. 



Egg. 

 stage. 



Larval 

 stage. 



Pupal 



stage. 



4.7 



17.6 



4.7 



27.0 



Length of life of third-brood adults. — One male kept with the larval 

 food plant lived 7 days, and two females each lived 5 days. 



Oviposition of third-brood adults. — Third-brood females deposited 

 eggs up to 4 days after emerging, the average being 1.9 days, 

 figuring from date of emergence to date of deposition of each egg. 



