ECONOMIC RELATIONS OF OUR BIRDS. 
489 
Tabular Summary of Economic Relations showing the number of specimens 
containing animal and vegetable food, and the 'number of insects and snails 
taken from the stomachs, classified as to economic relations under the 
heads Beneficial, Detrimental and Unknown Relations. 
Numbeii and Name of Speci¬ 
mens Examined. 
Of six House Wrens 
examined. 
t5 
<U 
.a 
o3 
+:> 
(3 
O 
O 
Classification 
OF Food. 
Animal food .. 
Vegetal food 
Ratios Represented by Lines. 
8 
25 
Beneficial ... 
Detrimental 
Unknown... 
Animal food. 
Vegetal food. 
1 
Beneficial. 
1 
Detrimental. 
12 
Unknown. 
Animal food.^ 
Vegetal food. 
Of three Winter Wrens 
examined. 
a 
cl 
o 
o 
Of fourteen Long-billed 
Marsh Wrens exam¬ 
ined . 
14 
1 
1 
6 
10 
a 
6 
1 
11 
45 
Beneficial ... 
Detrimental 
Unknown.... 
■ 
4 
Animal food. 
IQI 
1 
% 
P 
Vegetal food. 
B 
c3 
Beneficial. 
a 
2 
o 
o 
3 
Detrimental. 
« 
1 
5 
Unknown . 
Of four Short-billed 
Marsh Wrens exam¬ 
ined . 
Table showing the kind and number of insects and snails eaten by the Wrens. 
Number and Name of Speci¬ 
mens Examined. 
Classification 
OF Food. 
Ratios Represented by Lines. 
3 
7 
Caterpillars. ' 
SOI 
2 
o 
a 
3 
9 
Beetles. 
nsBKn 
Of six House Wrens 
examined. 
1 
u 
1 
Grasshopper . 
B 
6 
O 
O 
26 1 
Adult forms. 
^ 1 
3 
' ^ 1 
t 
Larvoe.' 
1 
3 
Ants. 
1 
1 
1 
Caterpillar .* 
1 
1 
Of three Winter Wrens 
1 
<V 
.3 
c3 
3 
1 
Beetles . 
1 
(SI 
exEmined. 
1 
1 
1 
Dragon-fly . 
B 
■ fl 
o 
3 
O 
13 
1 
1 
Adult forms.j 
Larve.j 
1 
