NATURAL. ENEMIES: PARASITIC INSECTS. 
14 5 
Here also the percentage of parasitism varies with the different 
lots, but is less than in case of material from Washington. The 
average parasitism for the season was 1.69 per cent, approximately 
the same as that from Washington. This would be of but little im- 
portance as affecting the abundance of the curculio. 
At Barnesville, Ga., in 1910, data of the same character were ob- 
tained from all the larva? infesting the fruit on a block of 31 Elbert a 
peach trees during the season, as shown in Table LXXXIV. These 
data show a considerably higher percentage of parasitism and also a 
larger percentage of larva? transforming to adults, with a correspond- 
ing decrease in the proportion of larva? failing to produce either para- 
sites or beetles. This was doubtless due to a more favorable condi- 
tion of the soil in the rearing cages. 
Table LXXXIV. 
-Record of emergence of Sigalphus curculionis for season, Barnes- 
ville, Ga., 1910. 
Lot No. 
Date larvae entered 
soil. 
Number 
of larvae. 
Number 
of Sigal- 
phus 
emerg- 
ing. 
Percent- 
age 
of larvae 
parasit- 
ized. 
Number 
of beetles 
emerg- 
ing. 
Percent- 
age 
of larvae 
trans- 
forming 
to adults. 
Percent- 
age 
of larvae 
unac- 
counted 
for. 
1 
May 2-3 
457 
566 
20 
96 
47 
25.97 
21.01 
8.30 
4.58 
3.83 
4.04 
2.52 
2.C8 
2.11 
3.68 
1.52 
28 
182 
276 
105 
109 
170 
117 
145 
101 
108 
45 
21 
13 
15 
133 
36.36 
39.82 
4S.76 
43.75 
52.15 
62.50 
73.59 
75.52 
71.13 
56.84 
68.18 
63.64 
46.43 
57. 09 
51.55 
37. 67 
2 
May 4-6 
39.17 
3 
May 7-9 
42.94 
4 
May 10 
240 
51.67 
5 
May 11 
209 
272 
159 
192 
142 
190 
66 
33 
28 
26 
258 
8 
11 
4 
4 
3 
i 


1 

44.02 
6 
May 12 
33.46 
7 
May 13... 
23. 89 
8... 
May 14-16. . . 
22.40 
9... 
May 17-19. . . 
26.76 
10 
May 20-23 
39. 4S 
11 
May 24-26 
30.30 
12 
May 27-29 
36.36 
13 
May 30-June 1 
June 2-8 
53.57 
14 
3.85 
4s. 16 
15 to 29 
June 9-Aug. 9 
May 2-Aug. 9 
48.45 
Total 
2,915 213 
7.31 
1,568 
53.79 
3S.90 
Observations on miscellaneous lots of larva? at Youngstown, X. Y., 
in 1905 (see Table LXXXY) show a much higher percentage of 
parasitism, the average for all lots being 18.66 per cent parasitized. 
These records, however, are not made from proportionate numbers of 
larva? throughout the season. The parasites were perhaps at their 
greatest abundance during the period under observation. 
Table LXXXV. — Record of emergence of (Sigalphus) Triaspis curculionis from miscel- 
laneous lots of larva-, Youngstown, N. Y, 1905. 
Lot No. 
Date 
larvae 
entered 
soil. 
Number of 
larvae. 
Number of 
Sigalphus 
emerging. 
Percentage 
of larva 
parasitised. 
! 
Juno 27 
do 
10 
40 
55 
80 
150 
150 
126 
1 SB 
1 
20 
8 
35 
20 
15 
20 
14 
10 (Hi 
2 
20 00 
3 
June 28 
June 29 
.. do .. 
4 
25 iX" 1 
5 
40 l\l 
6 
do 
7 
July i 
Julv 2 
Julv 3 
13 33 
8 
9 
10 
Julv 7 
20 00 
Total 
lJifl 
B 
17262°— Bull. 103—12- 
-10 
