CODLING MOTH IN NORTHWESTERN PENNSYLVANIA. 719 
to July 15. Considering, however, the above observations on oviposi- 
tion and the time of emergence of the first moths, it can closely and with 
some degree of accuracy be estimated that eggs were laid in the field 
from about June 17 to about July 22. 
Length of life of the moth.—Records were kept relative to the length 
of life of the moths which were confined in jars for oviposition. The 
results of these observations are given in Table [X, with a summary 
in Tables X and XI showing the extent of variation in the length of 
life of 161 moths. 
TasLe IX.—Length of life of moths of the spring brood in rearing cages. 
Date of— Date of— 
Number Number : 
of moths. Days. of moths. Days. 
Emer- Death Emer- Death 
gence. 4 gence. ss 
6 | June 21] July 2 11 1 | June 25 | July 12 17 
3 ko kos July 4 13 1 OnLsre July 14 19 
2 Ghose July 7 16 5 | June 29 | July 10 11 
6 | June 22 | July 2 10 2 GoOlze-- July 11 12 
3 doseses July 3 11 5 Goleee- July 12 13 
1 Gdoteeee July 9 17 2 GOrs-ne July 13 14 
21 | June 23 | July 2 9 2 Glo). 4556 July 14 15 
2 does==- July 3 10 2 dose July 15 16 
4 dole. July 4 11 5 do. July 16 17 
6 doe--2- July 5 12 4| July 1) July 11 10 
5 does July 10 17 5 Gores July 12 11 
1 Gorse July 12 19 2 Goxeee: July 13 12 
10 | June 24} July 1 7 3 dost July 15 14 
4 Gorse: July 5 11 1 Goreee- July 16 15 
2 Glovaaar ialiygeed 13 4| July 5} July 12 7 
10 | June 25 | July 2 Z 2 Gomeee: July 14 9 
Weer Oe eeers July 5 10 2 GOteaee July 16 11 
7PM Pefoloansos July 6 11 1 Gores 2 July 20 15 
Ase Orre2. July 7 12 1 Gores; July 22 17 
i) ees Kaeser July 9 14 2 | July 7 | July 16 9 
1 Peeaosree = July 10 15 USE adomsee- July 17 10 
il eco Colseeiae July 11 16 de Besa One. July 22 15 
TaBLE X.—Length of life of moths of the spring brood. Summary of Table TX. 
j | 
Days for | Days for 
Number | Days per} total || Number | Days per| total 
ofmoths.| moth. | number ||ofmoths.| moth. | number 
° of moths. of moths. 
24 te 168 6 15 90 
j 25 9 225 5 16 80 
20 10 200 13 17 221 
36 11 396 2 19 38 
14 12 168 | 
10 13 130 || TGUP S| Sereeac canes 1,800 
6 14 84 | 
si | 
TaBLE XI.—Length of life of moths of the spring Lrood. Summary of Table IX. 
Observations. | Days. 
IAW OTALOs. jacca cswctateaccce leatdic 1s 
Maxam oe- ccties ssi s<ns- 19 
Mii ures sce seen eee. 7 
It is evident from this table that the greater number died shortly 
after the first week after emergence. On an average the moths lived 
11 days; 2 moths lived 19 days and 24 moths lived 7 days. 
