524 
ECONOMIC RELATIONS OF OUR BIRDS, 
Family LANIID^: SimiKES. 
Fia. 122. 
White-rumped Shrike {Lanius ludovicianus excubiteroides). After Baird, Brewer and Ridgway. 
Tabular Summary of Economic Relations showing the name and number of speci¬ 
mens eating animal and vegetable food, and the number of insects, birds, 
mice and snails contained in the stomachs or killed by them, classified as to 
economic relations under the heads Beneficial, Detrimental and TJnknown 
Relations. 
Number and Name op Speci¬ 
mens Examined. 
Classification 
OF Food. 
15 
Animal food. 
Of fifteen W hi t e - 
rumped Shrikes ex¬ 
amined . 
Vegetal food 
7 
"S 
p 
8 
Beneficial . . 
13 
o 
42 
Detrimental. 
10 
24 
Dnknown.... 
Ratios Represented by Lines. 
mi 
