ECONOMIC RELATIONS OF OUR BIRDS. 
485 
FAmLY 8ITTIl)iE: Xutiiatciie3. 
Fig. no. 
Tabular Summary of Economic Relations shoioing the number of specimens con¬ 
taining animal and vegetable food, and the number of insects and spiders 
taken from the stoviachs, classified as to economic relations under the heads 
Beneficial, Detrimental and Unknown Relations. 
Number and Name of Speci¬ 
mens Examined. 
Of twenty-five White- 
bellied Nuthatches 
examined. 
23 
10 
23 
T3 
.g 
c3 
a 
o 
o 
Classification 
OF Food. 
2 
10 
56 
Animal food 
Vegetal food 
Beneficial ... 
Detrimental . 
Unknown.... 
Ratios Represented by Lines. 
Table showing the kinds and number of insects and spiders eaten by the 
Nuthatches. 
Number and Name of Speci¬ 
mens Examined. 
1 
o 
2 
f twenty-five White- 
14 
bellied Nuthatches 
evfl.mined. 
1 
a 
a 
22 
1 
Classification 
OF Food. 
Ratios Represented by Lines. 
2 
Ants. 
a 
6 
Lepidoptera.. 
ISBS9 
4 
Diptera. 
32 
Beetles. 
leiiirniinvin'rim 
1 
Spider. 
1 
03 
.Adult forms.. 
1 
Pupa. 
1 
4 
Larvae. 
■1 
4 
Of four Red-bellied 
N uthatches exam- 1 
jned. 
3 
I 
s 
24 
Adult forms .., 
3 
Ants . 
15 
Beetles.| 
