97 
injured the vines to a slight extent, but no moths could be seen feeding 
on it, nor could dead ones be discovered in the vicinity. 
From these tests it is safe to conclude that the use of poisoned sweets 
can never be a success in trapping the moths. 
LENGTH OF LIFE CYCLE. 
The duration of the embr3^onic, larval, and pupal instars has already 
been discussed, and the length of the life cycle is easily had by com- 
bining these records made on the same individuals. 
This has been done in the following table, which gives the duration 
of a series of life C3^cles during the different parts of the season of 
1904, at Paris, Tex. 
Table XXXVIII.— Lm^^/Zi of life cycle at Paris, Tex., 1904- 
Eggs laid. 
Eggs hatched. 
Larvae pupated. 
Moth emerged. 
Life 
cycle. 
Sum of 
effective 
tempera- 
tures. 
April 2 
April 10 
Mays 
May 31 
Days. 
59 
52 
53 
41 
32 
30 
36 
48 
35 
63 
° F. 
1,485 
1,420 
1,601 
April 12 
\pril 19 
May 16 
June 3 
April 29 
Mays 
June 3 
June 20 
July 6 
July 9 
July 27 
August 16 
1,597 
July 16 
July 19 
August 2 
August 17 
1 237 
Augusts 
Do 
Augusts 
do 
August 22. 
1,186 
August 25 
Septem^ber 11 
1,573 
August 28 
August 31 
September 8 
September 16 . . . 
October 15 
1,319 
September 5 
September V6 
October 10 
1,138 
October 10 
November 15 
1,417 
At Victoria, the previous season, some life-cycle records were made 
early in the year, averaging as follows: 
Table XXXIX. — Length of life cycle at Victoria, Tex., 1903. 
Eggs laid. 
Eggs hatched. 
Larvae pupated. 
Moth emerged. 
Life 
cycle. 
April 14 
April 18 
Mav 16 
June 2 
Days. 
49 
May 3 
Mav 6 
May 28 
June 14 
42 
The influence of the seasonal variation in temperature is very plainly 
to be seen, the length of the life cj^cle decreasing from fifty-nine days 
earh^ in the spring to only thirty da3^s during the hottest part of the 
summer. 
It will be noted that the sums of effective temperatures for the dif- 
ferent records vary from 1,186^ to 1,601°, with an average of 1,417° F. 
This latter may, no doubt, be accepted as very near the normal at 
moderate summer temperatures. 
