61 
Part VII] Beeson : Life History of Toon Borer. 
1915. The conditions under which the experiments recorded above 
were carried out were not considered satisfactory, and a repetition 
was attempted in the following season, but conditions were again 
adverse and negative results were obtained. 
1916. In this year records for the pupal stage of the 5th generation 
were obtained from inoculation experiments, see following Table 35. 
Table 35.— Length of the Pupal Period of the 5th Generation , 1915' 
1916. 
I ndividual 
number. 
Date of collec¬ 
tion of shoots. 
Date of 
Pupation. 
Date of 
Emergence. 
Total num ber 
of days. 
Ocober 1915— 
February 1916— 
March 1916— 
1 
12th . 
23rd 
9th 
15 
2 
12th 
19th 
4th 
14 
3 
19th . 
26th 
11th 
14 
4 
19th 
24th 
8th 
13 
5 
26th September 
16th 
. 
29th February 
13 
Days. 
The shortest length of the Pupal Period is . . . .13 
The average length of the Pupal Period is . . . .13-8 
The longest length of the Pupal Period is . . . .15 
The earliest recorded date of pupation is the 16th February and the 
latest date the 24th March. 
Moths of the Fifth Generation- 
The emergence of the moths of the fifth or spring brood has already 
been recorded at the commencement of the life-history studies. 
See pp. 20, Table 2, Plate V. The earliest record is the 18th 
February and the latest the 12th April, with the optimum period of 
emergence from the 2nd week in March to the 4th week in March. 
The annual life-cycle is thus completed with emergence of the moths 
of the fifth generation. A summary of the seasonal history will be 
found on pp. 64—65 and a graphic representation in Plate X. 
Variation in development and over-wintering of Larvce. 
It will be observed that throughout the seasonal history studies 
remarkably few cases of delayed or abnormal development were encoun¬ 
tered. A comparison of the records in this paper with those obtained 
in studies of the seasonal history of the codling moth in the Pecos Valley, 
New Mexico, [Quaintance and Geyer, 1917] is of interest as the habits of 
the two insects are not very dissimilar. The in vestigators in New Mexico 
[ 206 ] 
