160 The Food of Birds. 
Table of the Food of the Bluebird. ( Sialia sialis, L.) 
d 
re 
•— > 
Feb. 
March 
j April 
May 
| June 
| August 
Sept. 
0 
O 
2 
Nov. 
0" 
o> 
Q 
12 
5 
c 
H 
Ratio of each ele- 
ment to whole of food. 
Number of specimens 
IO 
21 
13 
10 
9 
12 
10 
108 
7 i 
Kinds of Food. 
Number of specimens, and ratio in which 
each element of food was found. 
I. Insects 
i. Hymenoptera 
Formicidae 
IO 
.92 
7 
.22 
21 
.88 
5 
.04 
2 
t 
2 
.04 
20 
•38 
4 
.04 
11 
•39 
13 
.88 
5 
.02 
5 
.02 
9 
.76 
3 
.02 
3 
.02 
9 
• 7 i 
7 
.21 
6 
.20 
9 
.89 
$ 
.04 
6 
• C 4 
12 
.91 
4 
.01 
4 
.01 
10 
.91 
4 
.04 
4 
.04 
5 
.16 
98 
41 
30 
8 
7 i 
5 
32 
2 
4 
78 
54 
1 
1 
2 
1 
32 
21 
5 
1 
2 
1 
•78 
.07 
.04 
•03 
.26 
.01 
. 12 
.01 
.20 
.07 
.09 
.06 
•03 
Tchneumonidae 
6 
.22 
2. Lepidoptera 
Arctiinae 
8 
.28 
1 
02 
9 
.21 
7 
•39 
5 
•13 
7 
.27 
7 
• 2 7 
7 
•37 
1 
.02 
Noctuidae 
Phalaenidae 
6 
.24 
5 
• 17 
3 
.19 
2 
.06 
1 
. 10 
2 
•05 
4 
• 14 
3 Diptera 
1 
t 
9 
.22 
6 
.05 
1 
.01 
16 
.19 
16 
. IO 
1 
t 
13 
• 5 i 
IO 
.08 
8 
.18 
5 
• 12 
t 
.28 
,06 
1 
.01 
4. Cole op ter a 
Carabidae 
Dytiscidae 
10 
.26 
4 
.09 
7 
• oS 
6 
.03 
4 
.02 
2 
.01 
‘ 4 
• 13 
2 
. 10 
Staphylinidae 
1 
t 
1 
t 
1 
.01 
Histeridae 
1 
t 
Byrrhidae 
Scarabaeidae 
Aphodi us 
3 
.09 
3 
09 
4 
.04 
2 
.03 
IO 
.33 
IO 
• 31 
2 
.05 
1 
•03 
5 
. 12 
4 
.04 
3 
■ 14 
3 
.02 
1 
t 
1 
t 
1 
.03 
Geotrupes 
1 
Phy 1 lophaga 
I 
.02 
1 
.02 
1 
.08 
2 
. 12 
TT n rvnm i a 
1 
01 
F laterida? 
1 
t 
1 
.01 
Tenebrionidae 
I 
