Allen.] 62 [June 3, 



at intervals of several days, generally in the Bad Lands, or about 

 rocky buttes. Found two or three nests, but they all contained 

 young birds. The nests were placed under projecting ledges of rock, 

 in broken or precipitous places. Later in the season the species was 

 more frequently observed, sometimes in small parties of four or five 

 together. 



65. Contopus virens var. Richardsoni All. Richardson's 

 Pewee. 



Seen at various points along the Yellowstone and Mtfsselshell. 



66. Empidonax minimus Baird. Least Flycatcher. 

 Common in the timbered bottom-lands of the Missouri at Fort 



Rice, frequenting the more open parts of the woodland, where fires 

 had killed the underbrush. A few were seen also on Heart River, 

 but neither this nor any other species of Empidonax was met with 

 elsewhere during the whole journey. 



CAPRIMULGID^}. 



67. Antrostomus Nuttalli Cass. NuttalPs Whippoorwill. 

 A few individuals seen in the pine ridges and ravines along the 



Musselshell. 



63. Chordeiles popetue var. Henryi All. Western Night- 

 hawk. 



Everywhere quite common. 



CYPSELID^. 



69. Chsetura pelasgia Steph. Swift 



Common along the Missouri at Fort Rice; seen elsewhere only 

 on the Yellowstone, near the mouth of Tongue River, where the 

 hollow trees of the heavy cottonwood forests doubtless afford them 

 the necessary breeding sites. 



ALCEDINID^. 



70. Ceryle alcyon Boie. Kingfisher. 



Two or three individuals, observed on the Musselshell, were all that 

 were seen during the whole journey. Their absence is readily ex- 

 plained by the turbid state of the streams, in which it would be 

 impossible for them to discover their finny prey, however abundant 

 it might be. 



