8 BULLETIN 261, U. S. DEPARTMENT OF AGRICULTURE. 



bark, or very often were rather insecurely glued to the sides and 

 bottom of the jar as well. 



From Table III it will be seen that the moths began to oviposit in 

 from 1 to 3 days after emergence, the average for seven observations 

 being 1.7 days. On the average, oviposition lasted 2.3 days, the 

 longest period observed being 4 days and the shortest 1 day. Girault 

 records three moths that oviposited in confinement in the insectary 

 at Washington, May 8, 1905, the duration of oviposition being 2 days. 



Table III. — Oviposition of the spring brood of moths of the plum borer, Winchester, Va., 



1913. 



No. of 



Number 



Date of — 



Days — 













From 



cage. 



of moths. 



Emer- 



First 



Last 



Before 



Of ovi- 



emer- 







gence. 



ovipo- 

 sition. 



ovipo- 

 sition. 



ovipo- 

 sition. 



position. 



gence to 

 last ovi- 

 position. 



1 



6 



Apr. 26 



Apr. 29 



May 2 



3 



4 



7 



2 



5 



May 2 



Mav 3 



6 



1 



4 



5 



3 



3 



3 



6 



6 



3 



1 



4 



4 



8 



4 



5 



6 



1 



2 



3 



5 



5 



5 



7 



7 



o 



1 



3 



6 



2 



5 



6 



7 



1 



2 



3 



7 



6 



6 



7 



8 



1 



2 



3 







3 



1 



4 

 1 



7 

 3 























Ave 



1.7 



2.3 



4 











Copulation was never observed, but evidently occurred very soon, 

 since in several instances fertile eggs were deposited within 24 hours 

 of emergence. In the absence of the male the female deposits infer- 

 tile eggs freely. 



The number of eggs deposited in confinement per female is indicated 

 in Table IV. 



Table IV. — Number of eggs of the plum borer deposited per female in confinement, 



Winchester, Va., 1913. 



Date. 



April 26 



May 2 



3 



5 



No. of 

 females 

 under 

 obser- 

 vation. 



Number of eggs. 



Depos- 

 ited. 



Average... 

 Maximum . 



Minimum 



Depos- 

 ited per 

 female. 



Records were kept of the number of eggs laid, in two jars contain- 

 ing 2 females each and in two jars containing 1 female each. The 



