170 BULLETIN OF THE 



on examining these holes that they entered horizotnally but a few inches, 

 and then turned abruptly downward, having about the size and form of the 

 holes the Colaples aural us is accustomed to make in decayed trees. They 

 appeared much attached to the spot, and from all the circumstances we 

 were led to believe that they had nested in the holes which we saw them 

 frequenting, as there were no trees within several miles that could have 

 served them as nesting sites. 



STRIGIDJE. 



76. Otus vulgaris, var. Wilsonianus. One specimen taken. 



77. Bubo virginianus. Occasional. Said to be quite frequent in winter. 



78. Athene hypogaea. Several colonies were met with in the vicinity 

 of Ogden, living chiefly in holes made by coyotes and other Canidce, no 



pecies of Cynomys occurring here. 



FALCONIDJE. 



79. Falco peregrinus. Common about the marshes of Salt Lake 

 preying upon the water-fowl. 



80. Falco columbarius. Moderately frequent. 



81. Falco sparverius. Exceedingly numerous. Along the Weber 

 River, below Weber Canon, a dozen or more were frequently seen in the 

 air at the same instant, catching grasshoppers. 



82. Buteo borealis. Not uncommon. 



83. Circus cyaneus, var. hudsonius. Abundant. Especially nu- 

 merous about the marshes, where they were constantly seen pursuing 

 the blackbirds, but apparently with indifferent success. 



84. Aquila chrysaetos. Said to be occasionally killed. 



85. Haliaetus leucocephalus. More or less frequent. 



86. Pandion haliaetus. A few seen. Said to be common in summer. 



CATHARTIDJE. 



87. Cathartes aura. Common. 



COLUMBID.E. 



88. Zenaedura carolinensis. Abundant. Said to breed generally on 



the ground. 



TETRAONIDJE. 



89. Tetrao obscurus. Reported to be common in the mountains. 



90. Centrocercus urophasianus. Common. Much less numerous 

 than formerly. A few years ago it is represented to have been exceed- 

 ingly abundant, but less than a dozen were seen by us during a quite 

 thorough reeonnoissance of the northeastern portion of the Great Salt Lake 

 Valley, they having never been known to be so scarce there before. 



91. Pedioecetes phasianellus, var. columbianus. Common, but said 



