316 
1881. 
(Mar.l7-; 
18." 
Archibuteo lagopus. 
They wero screaming incessantly this morning, the 
first time I ever heard their notes. The syllables 
P-Q-Q- t -P-l-Qg t Pl- QO uttered in a shrill whistling tone. 
The cry reminded me of the spring song of the Osprey but 
it was feebler and the notes were less continuous. 
Occasionally it resembled the long-drawn whistle of the 
Black-breasted Plover. Ordinarily Archibuteo is a very 
silent bird. 
