22 



BULLETIN 265, TJ. S. DEPARTMENT OF AGRICULTURE. 



Table VIII. — Length of life cycle of the first generation of the dock false-worm, Wenatchee, 



Wash., 1915 — Continued. 



Females. 



Indi- 

 vidual 

 No. 



Date of — 



Days in- 





Total 



life 



cycle 



in days. 



Egg dep- 



Hatch- 



Pupa- 



Emer 



Egg 



Larval 



Pupal 





osition. 



ing. 



tion. 



gence. 



stage. 



stage. 



stage. 



1 



Apr. 25 



May 7 



June 8 



June 15 



12 



32 



- 



51 



2 



...do 



...do 



...do 



June 16 



12 



32 



8 



52 



3 



...do 



...do 



June 10 



...do 



12 



34 



6 



52 



4 



...do 



...do 



...do 



...do 



12 



34 



6 



52 



5 



...do 



...do 



June 13 



June 18 



12 



37 



5 



54 



6 



...do 



...do 



June 22 



June 28 



12 



46 



6 



. 64 



7 



Apr. 27 



May 8 



June 12 



June 17 



11 



35 



5 



51 



8 



...do.... 



...do 



June 15 



June 20 



11 



38 



5 



54 



9 



Apr. 28 



May 9 



...do.... 



June 21 



11 



37 



6 



54 



10 



...do 



...do 



...do 



...do.... 



11 



37 



6 



54 



11 



...do.... 



...do 



June 18 



June 23 



11 



40 



5 



56 



12 



...do 



...do 



Jyne 20 



June 26 



11 



42 



6 



59 



13 



...do.... 



...do.... 



June 24 



June 29 



11 



46 



5 



62 



14 



Apr. 30 



May 11 



June 17 



June 23 



11 



37 



6 



54 



15 



...do.... 



...do.... 



June 18 



June 24 



11 



38 



6 



55 



16 



...do 



...do.... 



...do.... 



...do 



11 



38 



6 



55 



17 



...do.... 



...do.... 



June 20 



June 25 



11 



40 



5 



56 



18 



...do 



...do 



June 22 



June 28 



11 



42 



6 



59 



19 



May 8 



Mav 21 



June 18 



June 23 



13 



28 



5 



46 



20 



...do 



May 23 



...do 



...do 



15 



26 



5 



46 



21 



...do.... 



May 24 



June 27 



July 1 



16 



34 



4 



54 



22 



...do 



May 25 



July 1 



July 6 



17 



37 



5 



59 



Tots 

 Ave 



il 



265 

 12.0 



810 

 36.8 



124 

 5.6 



1199 

 54.5 



rage number of davs. 







Maximu 



m life cycle, 64 days; minimum, 46 days. 











Normal 



average lif 



ecvcle.. 



10.7 1 



35.9 



5.6 



53.4 





1 Taken from Table V. 



The parthenogenetic life cycle averages 46.1 days, the life cycle of 

 normal males, 50.7 days, and the female life cycle, 54.5 days. The 

 average life cycle of normal individuals of both sexes is 53.4 days. 



Length of life of first-brood adults. — The warmer weather at the 

 time the first-brood adults are flying appears to reduce the length of 

 their lives, and the average of six adults was 5.3 days, with a mini- 

 mum of 3 days and a maximum of 7 days. 



Oviposition of first-brood adults. — Oviposition begins, in the case of 

 first-brood females, sometimes within a few hours after emergence, 

 and the maximum period observed was 5 days, with an average of 

 1.7 days. Eggs were secured from six mated females, the average 

 number being 62.3, with a maximum of 92, and a minimum of 39; 

 four single females deposited an average of 67.7 eggs, with a maxi- 

 mum of 90, and a minimuni of 46. These females, being reared at 

 the laboratory from eggs deposited there by females of the previous 

 brood, may not have been quite as vigorous as those in nature, which 

 may account for the smaller number of eggs. 



