16 



of the entire cocoon stage, and he obtained the following results : The 

 shortest time was 13 daj^s, the longest time 23 daj^s, and the average 

 time 16. 75 days. 



Observations made for me hy Mr. Titus in 1900 for the purpose 

 of determining the entire cocoon stage and also the duration of its 

 two periods — as larva and as pupa — gave results which I liave tabu- 

 lated below. His averages for the entire period are somewliat larger 

 than those obtained by Mr. Taj^lor. It may be j)artially due to the 

 fact that he was compelled to open the cocoons daily before pupation 

 to determine their condition. This, however, should not affect the 

 pupa stage. 



Table VIII. — Time spent by codling moth from beginning of spinning stage to 

 appearance of moth. Fort Collins, Colo., 1900. 



Larvae taken. 



Larvae |Motli aj 

 pupated.! peared 



Num- 

 ber. 



Total 

 time. 



July 2 



Aug. 3 

 July 4 



Do .. 



Do 



July 6 



Do . 



-...do.. 



Do 



July 9 



July 3 



July 6 



Do 



Do . 



. do 



Do 



.i"l?o.^ 



Do 



Do 



July 9 



July 4 - . 



do 



Do 



....do.. 



Do .- 



Julv 8 



July 5 



....do.. 



Do -. 



July 9 



Do 



July 10 



Do 



July 9 



Do 



July 10 



Julv 6 



..-.do.. 



Do 



July 12 



Do -... — . 

 Do 



July 13 



Do 



-...do,. 



Do 



July 14 



Do 



July 18 



Julys 



July 12 



July 16 

 July 18 

 July 16 1 

 July 22 ! 

 July 24 

 Julv 18 

 July 20 

 July 21 

 July 22 

 July 23 

 July 24 

 July 20 

 July 21 

 July 23 

 July 21 

 July 22 

 July 23 I 

 ....do_--l 

 July 22 

 July 24 

 ....do..-' 

 July 2.5 [ 

 July 26 1 

 July 27 

 July 30 

 July 31 

 July 30 I 



Dans. 

 '14 

 16 

 14 

 20 



15 

 17 



18 

 19 

 20 

 21 

 16 

 17 

 19 

 16 

 17 

 18 

 18 

 17 

 IS 

 18 

 19 

 20 

 21 

 24 

 25 



Larvae taken. 



July 8-... 

 July 9.... 



Do... 

 July 10... 

 July 11.-. 



Do .. 



Do... 



Do... 



Do... 



Do.-. 



Do... 

 July 12... 



Do... 



Do... 



Do.-. 



Do... 



Do.-. 



Do... 



Do... 



Aug. 11. 



' Aug. 13 . 



Do ... 



Do... 

 Aug. 18 . 



Do... 

 Sept. 4... 



Larvae 'Moth ap- Num- 

 pupated.! peared. ber. 



Total 

 time. 



July 14 

 July 15 

 July 16 

 July 14 

 July 18 

 .--.do... 

 .--■-do... 

 ....do... 

 July 19 

 ..-.do... 

 .-..do... 

 July 16 

 ....do. . 

 July 17 

 July 19 



July 20 

 ... do... 

 ....do... 

 Aug. 13 

 Aug. 18 

 Auff. 17 

 ....do... 

 Aug. 24 

 Sept. 6 

 ..-.do... 



July 31 



.-..do--. 



---.do... 



!..-.do..- 



! July 30 



July 31 



I Aug. 2 



I Aug. 1 



Aug. 2 



Aug. 3 



Aug. 4 



July :3(t 



July 31 



Aug. 3 



, Aug. 4 



Aug. 6 



Aug. 4 



Aug. 10 



.-.do... 



Aug. 30 



Aug. 31 



I Sept. 5 



Sept. 6 



do... 



I Sept. 16 

 I do... 



Days. 



The time required tor x^upation, according to the above record, after 

 the larva comes down from the tree, was, for 1 larva, 1 da}'; for 

 larv^, 2 days; for 10 larvae, 3 days; for 18 larv?e, 1 days; for 15 larvae, 

 5 days; for 7 larvae, 6 days; for 31 larvae, 7 days; for 14 larvae, 8 days; 

 for 1 larva, 12 days; for 1 larva, 19 days. The average time Avas 5.() 

 days and the range in time from 1 to 19 days. Number of larvae in 

 the record, 101. 



The time si)ent in the pupa state by tlie same larvae was as follows: 

 Four were pup?e 10 daj^s; 2 were pupa? 11 days; 23 were pupa^ 12 days; 

 13 were pup?e 13 days; 24 were pup?e 14 days; 13 were pup^e 15 days;' 

 10 were pup?e 16 days; 7 were pupa^ 17 daj^s; 3 were pupa? 18 days; 2 

 were pupjrB 19 days; 1 was pupa 20 days, and 2 were pupa^ 21 days. 

 The shortest time in the pupa state was 10 days and the longest time 

 21 days. The average time was 14 days. 



