26 



BULLETIN ,265, XT. S. DEPARTMENT OF AGRICULTURE. 



Oviposition of second-brood adults. — Observations were made on a 

 single pair of second-brood adults. The female deposited 34 eggs 

 the first day after she emerged and 40 eggs the second day, making 

 74 eggs in all. 



THIRD GENERATION. 



Incubation period of third-brood eggs. — Seventy-four fertile eggs 

 of this brood hatched in 4 to 6 days after being deposited, with an 

 average incubation period of 4.7 days. No parthenogenetic eggs 

 were secured. 



Length of life of third-brood larvae, by instars. — Twenty-nine larvae 

 were reared from fertile eggs, 9 of them pupating, the remainder 

 either dying or burrowing into the earth at maturity and being lost. 

 No parthenogenetic larvae were reared. Table XIV gives a summary 

 of the length of larval life by instars of all larvae reared.' 



Table XIV. — Summary of larval life of third generation of the dock false-worm, by instars, 



Wenatchee, Wash., 1915. 



Normal larvee. 



First instar. 



Second instar. 



Third instar. 



Fourth instar. 



Fifth instar. 



Sixth instar. 



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28 



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12 



17 



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34 



16 



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32 



8 



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19 

 3 



3. 



4 



57 

 12 



5 



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15 



5 



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15 



6 

 2 



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3 

 4 

 6 



18 

 8 

 6 



7 

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 5 



28 



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38 



25 





52 

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24 





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 2.1 





29 





82 







15 





56 



Max 5 











Av. 





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Max 



3 



Max 



3 



18 





49 



Av.. 





3.7 



Min 4 



Max 





.. 4 



Min 



1 



Min 



1 



Av 



2.7 



Max. 





5 





Min 





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Max 



Min 



6 



1 



Min. 





2 





Length of life of tliird-brood pupse. — Pupal records were obtained 

 from 9 pupae of fertile eggs, 4 males and 5 females, and these are 

 given in Table XV. 



Table XV. — Summary of pupal stage of third generation of the dock false-worm, Wenatchee, 



Wash., 1915. 



Number 

 of indi- 

 viduals. 



■ Days. 



Each. 



Total 



4 

 4 

 1 



4 

 5 

 6 



16 

 20 

 6 



9 





42 



Average 



days. 



Maximu 



Minimu 



number 



m 



m 



of 

 .... 4.7 

 .... 6 



.... 4 



