CODLING MOTH IN SANTA CLAEA VALLEY. 127 



Table XII. — First-brood eggs. Incubation period of eggs laid in rearing cages — Contd. 









Red ring. 



Black spot. 



Hatched. 





No of 



Num- 



Date of 













Length 















apple. 



ber of 



eggs. 



deposi- 

 tion. 



Date of 

 appear- 



Num- 

 ber of 



Date of 

 appear- 



Num- 

 ber of 



Date. 



Num- 

 ber of 



of egg 



stage. 









ance. 



eggs. 



ance. 



eggs. 





eggs. 























Days. 



13 



132 



May 14 



(May 14 

 May 15 



JMay 10 



(May 17 

 May 18 



IMay 19 



12 

 13 

 29 

 10 

 36 

 12 



May 20 

 [May 21 

 fMay 22 

 May 23 



15 

 23 

 61 

 30 



(May 23 

 May 24 



{May 25 

 May 26 



IMay 27 



22 

 39 

 30 

 16 

 12 



9 



10 

 11 

 12 

 13 









fMay 16 

 JMay 17 

 iMay 18 

 iMay 20 



10 



30 



11 



6 



(May 20 

 May 21 



1 

 3 



May 25 



25 



10 



14 



69 



May 15 



{May 22 



15 



iMay 26 



23 



11 









May 24 

 IMay 25 



31 

 14 



May 27 



13 



12 









fMay 17 

 ^May 18 

 iMay 19 



1 



14 

 2 



(May 20 



2 



May 24 



2 



8 



15 



24 



May 10 



JMay 22 

 (May 24 



5 

 9 



May 26 

 May 27 



2 

 3 



10 

 11 









iMay 26 3 



May 29 



22 



13 









fMay 18 

 I May 19 

 IMay 20 

 May 22 



23 

 43 

 16 



8 



JMay 24 1 



May 27 



11 



10 



16 



100 



May 17 



^May 26 | 32 



May 28 



55 



11 









jMay 27 48 



May 29 



10 



12 



In all 897 eggs were deposited and 720 hatched, or slightly over 80 

 per cent. The maximum length of the egg stage was 17 days, the 

 minimum 8, and the average 12.4 days. (See Table XIII.) The red 

 ring appeared after from 1 to 8 days but averaged from 2 to 5 days. 

 The black spot appeared from 6 to 15 days after the eggs were 

 deposited but usually appeared after 8 to 9 days. 



An examination of Table XII shows that after the first lot of eggs 

 had been deposited the length of the egg stage was fairly constant 

 throughout the oviposition period of the spring moths. As has been 

 observed by other writers, eggs which were deposited on the same 

 day sometimes varied from one to three days in the length of the egg 

 stage. This was due to differences in embryological development of 

 the eggs within the body of the female. 



Table XIII. — Incubation period of first-brood eggs. Summary of Table XII. 



Observations. 



Days of 

 incuba- 

 tion. 





12.4 

 17 



8 



Maximum 



Minimum 



A summary of the incubation periods for the total number of eggs 

 deposited by the spring-brood moths is shown in Table XIV. 



