COUES ON BIRDS OF DAKOTA AND MONTANA. 613 



ANTROSTOMUS YOCIFEEUS, ( Wils.) B^. 



Whippoorwill. 



Although I took no specimens of this bird, its unmistakable notes 

 were heard every night in June at Pembina, assuring me of its presence 

 iu numbers in the heavy timber of the river-botton. This locality is very 

 near its northern limit, and it probably is not found any distance west 

 of the Eed River. 



CHORDILES YIRGINIANUS, {Briss.) Bp. 



I^IGHT-HAWK; BULL-BAT. 



Occurs in summer throughout the whole region surveyed, and is in 

 most places very common. The birds of the arid Missouri region are 

 referable, I suppose, to var. henryi. Eggs were found at Pembina 

 June 13, and at the mouth of Milk River on the 1st of July; in both 

 instances two in number, laid on the bare ground. So late as the 23d of 

 July, newly hatched young were found at one of our camps on Turtle 

 Mountain. Notwithstanding that they lay in the midst of a populous 

 camp, where the men and animals constantly passed the spot, the female 

 continued to brood them with courage and patience, and on too near 

 approach would feign a broken wing, and tumble about in a manner that 

 would have seemed ridiculous could her tender object have been forgot- 

 ten. The male bird made a great ado, dashing down from overhead, 

 but apparently without any clear idea of what was expected of him, or 

 bow to do it. Upon one of my visits to the spot I found that the young- 

 had been transported since I had been there last, though only to a dis- 

 tance of two or three yards. 



JAst of specimens. 



