64 
Indian Forest Records. 
[Vol. VII. 
Summary of the Seasonal History Studies- 
The first or flower generation. —The earliest recorded emergence of 
spring brood moths is the 18th February. The first generation may, 
therefore, commence in the fourth 
development is :— 
week of February. 
The average 
Days. 
Incubation period of egg . 
. 
4—5 
Period of first larval stage . 
. 
4 
,, second larval stage 
. 
2 
„ third larval stage 
. 
2 
„ fourth larval stage 
. 
4 
„ pupal stage 
, .... 
8—12 
Total cycle, egg to moth 
24—29 
Theoretically, the earliest eggs of this brood should produce moths 
in the field in the third or fourth week of March, but the earliest 
insectary records for 2nd brood moths is the 8th April. 
The limits of the generation lie within a period of 8 to 9 weeks. 
The second or fruit generation. —The theoretical dates for the appear¬ 
ance of moths from eggs laid in the fourth week of March is in the third 
or fourth week of April; the earliest insectary record is the 1st May. 
The average development is :— 
Days. 
Incubation period of egg ...... 
Period of first larval stage ...... 
,, second liarval stage ..... 
„ third larval stage ..... 
„ fourth larval stage . . . . . 
„ pupal stage ...... 
Total cycle, egg to moth 
4—5 
4 
2 
2 
4 
8—12 
24—29 
The limits of the generation lie with a period of 9 to 10 weeks. 
The third or shoot generation .—The theoretical date for moths of 
the third generation is in the second week of July. The average deve¬ 
lopment is :— 
Incubation period of egg ...... 
Days. 
. 4— 5 
Period of first larval stage ...... 
. 7— 9 
,, second larval stage ..... 
. 7—10 
„ third larval stage ..... 
. 14—16 
„ fourth larval stage ..... 
. 21—24 
„ pupal stage ...... 
. 13—14 
Total cycle, egg to moth 
. 66—78 
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