COUES ON BIRDS OF DAKOTA AND MONTANA. 623 



FALCO B.ICn ARDQOISI, Eidgw. 

 Eichaedson's Merlin. 



One specimen, the only individual of this species observed, was taken 

 on the headwaters of the Mouse Eiver, September 8, 1873. I had no 

 difficulty in approaching and shooting it, as it sat on the lower limb of 

 a small tree. The stomach contained the remains of a Sparrow. 



Since the supposed similarity of the sexes of this bird proves not 

 to hold good, one of the strongest points of distinction between it 

 and F. columharius disappears, and the probability is that it is not 

 specifically separable from the latter. 



FALCO SPAEVERIUS, Linn. 



Sparrow Hawk. 



Very abundant throughout the region surveyed. The specimens 

 taken on Turtle Mountain, August 8, 1873, had at that date nearly as- 

 sumed their first complete plumage ; they were all members of the same 

 family, and had not quite given up their companionship. 



List of specimens. 



