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 XYI gives a partial life cycle (omitting the 

 egg stage) of 5 males and 5 females. 



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



Wenatchee. Wash., 1915. 



Males. 



Indi- 

 vidual 

 No. 



Date of — 



Days 





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 



17 

 17 



5 

 6 



To1 





68 



17 



m, 21 da 



21 

 5.2 



ys. 



110 

 22 



Av 

 Maxin 



;rage number of days. - 



nun life cycle, 23 days; minimu 



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 

 IS 

 15 



5 



4 

 4 

 4 

 4 



23 

 23 

 21 

 22 

 19 



Tot 



al 



87 

 17.4 

 n, 1# da] 



21 



4.2 



r s. 



108 

 21.6 



Av 







Maxin 



mm life cy 



cle, 23 day 



s; minimui 



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. 



Tabi.b 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. 



Larval Pupal 

 stage, : stage. stage. 



1.7 17.6 1.7 



27.0 



L ngih "I l'i< of third-brood adults.— One male kept with the larval 

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



Oviposition oj third-orood adults. Third-brood females deposited 

 eggs up to 1 days after emerging, the average being L.9 days, 

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



