18 



BULLETIN 265, U. S. DEPARTMENT OF AGRICULTURE. 



Emergence of spring-brood adults. — Table III gives the time of emer- 

 gence of 201 adult male and female sawflies of the spring brood, 

 including those hibernating both in stems and in apples. The emer- 

 gence covers a period of over seven weeks, disregarding the single 

 femaie that emerged on June 16, but the maximum emergence 

 occurred on April 23, only 10 days after the first emergence. 



Table III. — Time of emergence of spring-brood adults of the dock false-worm, Wen atchee 



Wash., 1915. 



Date. 



Number of— 



Total 

 number. 



Date. 



Number of— 



Total 



Males. Females. 



Males. 



Females. 



number. 



Apr. 13 



1 



1 ! 

 1 

 1 

 3 1 3 

 14 ! 4 

 6 10 



1 

 2 

 1 

 1 

 6 

 18 

 16 

 6 

 5 

 29 

 13 

 12 

 21 

 14 



May 2 



1 



2 



1 

 1 

 1 

 

 

 1 

 1 

 

 



1 





 



2 



2 

 5 

 1 

 5 

 3 

 1 

 2 

 

 1 

 1 

 1 

 3 

 1 



3 



Apr. 14 



May 4 



4 





May 5 



6 



Apr. 16 



Mar 6 



2 



Apr. 18 



May 7 



6 



Apr. 19 



Mav 8 



3 



Apr. 20 



Mav 18 



1 



Apr. 21 ; 



5 

 4 

 12 

 7 

 2 



1 

 1 



17 

 6 



10 



May 19 



3 



Apr. 22 



May 20 



1 



Apr. 23 



May 21 



1 



Apr. 24 



May 24 



1 



Apr. 25 



May 27 



2 



Apr. 26 



7 



June 4 



3 



Apr. 27 



3 

 2 

 3 



11 



June 16 



1 





7 1 -9 



7 



Total 





Apr. 29. 



81 i 120 



201 















Length of life of spring-brood adults. — Table IV gives the length of 

 life of 7 males and 11 females confined in lantern chimneys placed 

 over the larval food plant. 



Table IV. — Length of life of spring-brood adults of the dock false-worm, Wenatchee, Wash., 



1915. 



Males.. 



Females. 



Number 

 of indi- 

 viduals. 



Date- 



Days- 



■1 



Number 

 of indi- 

 viduals. 



Date — 



Days- 



Emerged. 



Died. 



Each. 



Total. 



Emerged. 



Died. 



Each. 



Total. 



1 

 1 

 1 

 2 

 1 

 1 



Apr. 23 



...do 



Apr. 24 



. .do 



Apr. 28 

 Apr. 29 



May 8 

 May 9 

 Apr. 28 

 May 5 

 May 8 

 May 21 



15 

 16 

 4 

 11 

 10 

 22 



15 

 16 

 4 

 22 

 10 

 22 



3 

 3 

 1 

 1 



1 

 1 



1 



Apr. 23 

 Apr. 24 

 Apr. 28 



.. .do 



...do.... 

 ...do.... 

 May 2 



May 8 

 May 5 

 May 8 

 May 9 

 May 13 

 May 15 

 May 14 



15 

 11 

 10 

 11 

 15 

 17 

 12 



45 

 33 

 10 

 11 

 15 

 17 

 12 



7 

 Average 



number of days 



m 



89 



12.7 

 22 

 4 



11 



Average 



lumber of 



days 



143 

 13.0 



Maximum 







17 



Minima 



m 





Minimun 



l 



10 



There is little difference between the length of life of the males and 

 females, the average being 12.8 days, and it is probable that adults in 

 the open would average about the same. Thirty-five adults were 

 confined in the glass vials in which they emerged, with no food or 

 moisture, and these lived an average of only 8.3 days. 



