COUES ON BllvDS OF DAKOTA AND :^IONTANA. 609 



List of specimens. 



TYEANNUS VERTIOALIS, Say. 



Arkansas Flycatcher. 



In the Eed Eiver region, T. caroUnensis alone represents tbe genus j 

 but throughout the Upper Missouri and Milk River country the two are 

 found together, and it is hard to say which is the most numerous. 

 They have much the same general habits, and often associate intimately 

 together; indeed, I have known one tree to contain nests of both 

 species. The cries of the verticalis are louder and harsher, with less of 

 a sibilant quality, than those of the Kingbird ; but there is little else 

 to note as different. The nests of the verticalis are bulky and con- 

 spicuous, all tbe more easily found because the bird has a way of leav- 

 ing the general woods of the river-bottom to go up the ravines thai; 

 make down from the hillsides, and there nest on some isolated tree, 

 miles away, perhaps, from any other landmark. Taking nests of both, 

 species at the same time, I found that those of verticalis were generally 

 distinguishable by their larger size and softer make, with less fibrous 

 and more fluflfy material ; but the eggs, if mixed together, could not 

 be separated with any certainty. The sets of eggs taken during the 

 latter part of June consisted of from three to six. Eggs were found as 

 late as the second week in July. The nests were placed in trees at a 

 height of from five or six to forty or fifty feet, generally in the crotch of a 

 horizontal limb, at some distance from the main trunk ; but in one case a 

 nest was placed in the crotch which the first large bough made with the 

 trunk. In one case, a pair of the Flycatchers built in the same tree that 

 contained the nest of Swainson's Buzzard, and both kinds of birds were 

 incubating at peace with each other, if not with all the world, when I 

 Bull. iv. No. 3 5 



