CODLING MOTH IN COLORADO. 113 



Deposition of first-brood eggs. — The spring-brood moths just re- 

 ferred to were employed in the oviposition studies. The earliest 

 deposition of eggs of the first brood in 1915 occurred May 15, the 

 greatest number of eggs was deposited on June 10, while the last 

 egg was laid July 8. In the following year, the first eggs were de- 

 posited May 19, the crest of deposition was reached June 9, and the 

 oviposition period ended July 7. 



Hatching of first-brood eggs. — Hatching of first-brood eggs began 

 in 1915 on May 27, and the eggs were hatching in largest numbers 

 June 17. The last of the eggs hatched July 13. Hatching of first- 

 brood eggs the next year commenced June 1, and on June 16 the 

 eggs were hatching in maximum numbers, while the last of the eggs 

 hatched on July 11. 



First-brood larvae leaving the fruit. — The time of larva? leaving 

 the fruit refers only to the insectary-reared individuals. In 1915 

 the first of these larvae left the fruit June 21, on July 20 the largest 

 number of larvae made their exit from the apples, and on August 

 10 the last first-brood larva completed its feeding. According to the 

 observations in the field, the first larvae were collected in the Edwards 

 orchard June 22 and in the Hamilton orchard June 28. In 1916 

 the first of the insectary-reared larvae left the fruit June 20, the 

 largest number left the fruit on July 2, and the last larva of this 

 brood left the fruit August 15. But in the field the larvae left the 

 fruit at least three days earlier as shown by collections made in the 

 Edwards and Hamilton orchards on June 17. 



Pupation of first-brood larvae, — The time of pupation of the first- 

 brood insectary-reared larvae in 1915 was as follows: First pupa- 

 tion June 27, maximum pupation July 6, last pupation August 4 ; in 

 1916 the first pupation took place June 25, the maximum pupation 

 occurred July 7, and the last larva transformed on August 11. 



Emergence of first-brood moths. — The time of emergence of first- 

 brood moths as indicated in the diagrams refers to the moths that 

 transformed from the field-collected larvae. In 1915 the first moths 

 of this brood (Hamilton orchard material) issued July 10, the 

 maximum emergence occurred August 9, and the theoretical limit of 

 emergence was August 19. In the following year all of the moths 

 from the transforming larvae collected in the Hamilton and Ed- 

 wards orchards were used for oviposition purposes. The first of 

 these moths issued June 25, the maximum emergence occurred July 

 28, and the theoretical limit of emergence was August 13. 



Deposition of second-brood eggs. — Eggs of the second brood were 

 first deposited in 1915 on July 12, on August 14 they were laid in 

 maximum numbers, and on September 15 the last eggs were de- 

 posited. In 1916 the earliest deposition occurred July 3, the maxi- 

 19552°— 21 8 



