CODLING MOTH IN NORTHWESTERN PENNSYLVANIA. 93 
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 X XTX and XXX.) 
TaBLE XXIX.—Incubation periods of second-brood eggs. Summary of Table X X VIII. 
Appearance of red Appearance of Total incubation 
ring. black spot. period. 
Number Number Number | 
Number of Number of Number of | 
of days. | observa- || of days. | observa- || of days. | observa- | 
tions. | tions. tions. 
1 6 | 5 4 6 1 
2 32) | 6 26 7 127 
3 30 Ul. 19 | 8 20 
4 3 8 4 9 16 
9 1 10 7 
10 3 11 2 
11 8 12 4 
12 7 13 5 
14 4 
15 2 
16 1 
TABLE XXX.—JIncubation periods of second-brood eggs. Summary of Tables XX VIIT 
and X XIX. 
Number of days— 
é | 
Observations. For appear-| For appear- aden a 
ance of ance of pation 
red ring. | black spot. : 
AVOTAPO SESE. s oan seceaacoas 2.4 7.66 9. 47 
Mexia Sse a ear 4 12 16 
Minimunen seeeepsea eens 1 5 6 
Eggs deposited from September 15 to September 22, inclusive, 
failed to hatch because of prevailing cold weather. 
SECOND-BROOD LARV&. 
Time of hatching.—The extent of the hatching period of second- 
brood larvee 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 XXXJI, developed about normally and 
entered hibernation. 
