CODLING MOTH IN NORTHWESTERN PENNSYLVANIA. 79 
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 IX, with a summary 
in Tables X and XI showing ihe extent of variation in the length of 
life of 161 moths. 
TaBLeE IX.—Length of life of moths of the spring brood in rearing cages. 
Date of— Date of— 
Number Number 
of moths. Days. || of moths. i Days. 
Emer- | Death Emer- | Death 
gence ; gence : 
6 | June 21] July 2 itil 1 | June 25 | July 12 17 
Sulsae(oKo Race July 4 13 lier Kayes July 14 19 
Dee edOvacs< July 7 16 5 | June 29 | July 10 11 
6 | June 22 | July 2 10 Zee Oeeeee July 11 12 
Bl Sere keene July 3 11 BN SS6 oa July 12 13 
1 Neat esas Ce evens July 9 17 2h te sdOsees. July 13 14 
21 | June 23 | July 2 9 2) | |paeGOre eae July 14 15 
Aisa Oee eo July 3 10 PAE 30 oySe ae July 15 16 
Aue seOlsoe= July 4 11 5) |b a-dousen. July 16 17 
Gy Reed obsene July 5 12 4| July 1] July 11 10 
SE adores. July 10 17 5) |bodonsee- July 12 11 
1 aC (sae July 12 19 2 pend Obenee July 13 12 
10 | June 24 July 1 7 Sy |pae Osea July 15 14 
Aes QOrsuee July 5 11 1). adores. July 16 15 
ii |PeedOeeene July 7 13 4| July 5] July 12 u 
10 | June 25/ July 2 if PANN ee(6 Fo jaa ee July 14 9 
7 Wee Oseee. July 5 10 Dulko GOrseee July 16 11 
Ze\ssed Osetia July 6 11 Llceedos a. July 20 15 
Ape Ouse. July 7 12 ty | Eee doeseee July 22 17 
Di estdoe eee July 9 14 2} July 7] July 16 9 
Feed obetne July 10 15 LE Reed ones. July 17 10 
HW eorar Coes ae July 11 16 1H} Pt Of erc= July 22 15 
TaBLE X.—Length of life of moths of the spring brood. 
Days for Days for 
Number | Days per| total Number | Days per} total 
ofmoths.| moth. | number ||ofmoths.| moth. number 
of moths. of moths. 
24 7 168 6 15 90 
25 9 225 5 16 80 
20 10 200 13 17 221 
36 11 396 2 19 38 
14 12 168 
10 13 130 ij ban ee Jeeee eee 1,800 
6 14 84 
Summary of Table IX. 
TaBLE XI.—Length of life of moths of the spring brood. Summary of Table IX. 
Observations. Days. 
AVETB POs aK ee nate ate ees 11.18 
i) 5-9 foal bhaineann eae eae 19 
Miniminmic sso eisai feees 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. 
