CODLING MOTH IN NORTHWESTERN PENNSYLVANIA. 98 
The incubation period ranged from 6 to 16 days, with an average 
of 9.47. In the time of appearance of the red ring, the range varied 
from 1 to 4 days, with an average of 2.4 days. The black spot 
appeared on an average 7.66 days after egg deposition, and hatching 
generally took place from 1 to 2 days after the black spot had been 
observed. (Tables XXITX and XXX.) 
TasbLe XXIX.—Incubation periods of second-brood eggs. Summary of Table XX VIII. 
Appearance of red Appearance of || Total incubation 
ring. | black spot. | period. 
aaa 1] 7 
| Number | | Number | | Number 
Number | of || Number | of Number | of 
of days. | observa- || of days. | observa- || of days. | observa- 
| tions. || | tions. | tions. 
i 
1 6 5 4 || 6 a 
2 32 6 26 || 7 12 
3 30 7 19 8 | 20 
4 3 8 4 9 | 16 
9 1 10 if 
10 oa | ib 2 
ll 8 | 12 4 
12 104 13 5 
14 4 
15 ll 
| 16 ile | 
| ! 
TaBLE XXX.—Incubation periods of second-brood eggs. Summary of Tables XX VIII 
and X XIX. 
i 
| Number of days— 
Observations. For appear-, For appear- Aegina: 
ance of | ance of BeatiGrs 
| redring. | black spot.| ~~ : 
| IR ee eee Se 2.4 | 7.66 | 9. 47 
Wie wolsiWisle Boo eseeeec an ees| 4 12 | 16 
IMGT ae re ce | 1 5 6 
Eggs deposited from September 15 to September 22, inclusive, 
failed to hatch because of prevailing cold weather. 
4 
SECOND-BROOD LARV. 
Time of hatching.—The extent of the hatching period of second- 
brood larve can be accurately determined, since eggs were obtained 
August 6 from the earliest emerging moths and subsequently almost 
daily until September 22. In the cages the first larve hatched 
August 13 and the last September 21; late-deposited eggs, as already 
stated, failed to develop because of cold weather, which limited the 
number of the second-brood larve considerably. 
Feeding period.—From a number of larve that hatched in the 
cages, 100, as given in Table XX XI, developed about normally and 
entered hibernation. 
