30 



THE HAWKS AND OWLS OF THE UNITED STATES. 



Length: 19.50 to 24.00 inches (495 to 610"""); extent, 40.00 to 45.00 

 inches (1016 to 1143'"'"); wing, 12.90 to 16.00 inches (328 to 406™"^); 

 tail, 8.80 to 10.50 inches (223 to 267'""^). 



Taile shoiving the results of examinations of IM stomaclis of the Marsh Haivk 



(Circus hudsonius). 



