THE DOCK FALSE-WORM. 



21 



Table VII. — Summary of pupal stage of first generation of the dock false-worm, Wenat- 



chee, Wash., 1915. 



Parthenogenetic males. 



Normal males. 



Females. 



Number 

 of indi- 

 viduals. 



Days — 



Number 

 of indi- 

 viduals. 



Days- 





Number 

 of indi- 

 viduals. 



Days — 



Each. 



Total. 



Each. 



Total. 



Each. 



Total. 



2 

 5 

 2 

 1 



4 

 5 

 6 



7 



8 

 25 

 12 



1 



2 

 6 



4 

 5 

 6 



4 



10 

 36 



1 

 9 



10 

 1 



1 



4 

 5 

 6 



7 

 8 



4 

 45 

 60 



7 

 8 









50 



.. 5.5 

 .. 6 

 .. 4 



10 





52 











Average 



Maximum 



Minimum 



22 





124 



.... 5.6 



.... 8 



Average 5.2 



Maximum 7 



Minimum • 4 



Average. 

 Maximur 

 Minimun 



n 















l 



.... 4 



Life cycle and emergence of adults of first generation. — Table VIII 

 gives the complete life cycle of 10 parthenogenetic males, 9 normal 

 males, and 22 females. By life cycle is meant the period of growth, 

 or the period from the deposition of the egg to the emergence of the 

 adult. It does not include the length of adult life, during which no 

 growth occurs, nor the interval between emergence of adult and op- 

 position, these figures being given in a following paragraph. 



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



Wash., 1915. 



Parthenogenetic males. 



Indi- 

 vidual 

 No. 



Date of— 



Days in — 



Total 

 life 

 cycle 



Egg dep- 



Hatch- 



Pupa- 



Emer- 



Egg 



Larval 



Pupal 



osition. 



ing. 



tion. 



gence. 



stage. 



stage. 



stage. 



in days. 



1 



Apr. 30 



May 13 



June 15 



June 20 



13 



33 



5 



51 



2 



...do 



...do 



June 16 



June 22 



13 



34 



6 



53 



3 



...do 



...do 



June 17 



June 23 



13 



35 



6 



54 



4 



May 1 



May 14 



June 15 



June 20 



13 



32 



5 



50 



5 



...do 



...do 



...do 



...do 



13 



32 



5 



50 



6 



May 9 



May 19 



June 14 



June 19 



10 



26 



5 



41 



7 



...do 



...do 



June 17 



June 24 



10 



29 



7 



46 



8 



May 25 



June 3 



June 30 



July 4 



9 



27 



4 



40 



9 



...do 



...do 



...do 



...do..... 



9 



27 



4 



40 



10 



May 26 



June 4 



June 26 



July 1 



9 



22 



5 



36 



Tots 



il 



112 

 11.2 



297 

 29.7 



52 

 5.2 



461 



46.1 



Ave 



rase number of davs 









Maximum life cycle, 54 days; minimum, 36 days. 



Normal males. 



1 



Apr. 25 



Mav 7 



June 10 



June 16 



12 



34 



6 



52 



2 



Apr. 27 



May 9 



June 19 



June 24 



12 



41 



5 



58 



3 



...do 



...do 



June 21 



June 27 



12 



43 



6 



61 



4 



Apr. 30 



May 13 



June 10 



June 16 



13 



28 



6 



47 



5 



...do 



...do 



June 11 



...do 



13 



29 



5 



47 



6 



...do 



...do 



June 13 



June 17 



13 



31 



4 



48 



7 



...do 



...do 



June 16 



June 22 



13 



34 



6 



53 



8 



May 8 



May 16 



...do 



...do 



8 



31 



6 



45 



9 



...do 



...do 



June 17 



June 23 



8 



32 



6 



46 



Total ...... 



104 



303 



50 



457 



Average number of days 



11.5 



33.6 



5.5 



50.7 





Maximum life cycle, 61 days; minimum, 45 days. 



