50 Wyoming Birds. 



MICROPODIDAE (Swifts). 



The Swifts are not numerous enough in Wyoming to deserve 

 more than mere mention. They, like their allies, feed entirely upon 

 insects which they catch while on the wing. Mosquitoes form a 

 considerable part of their diet. 



References : 



1. Biological Survey Bulletin No. 38, p. 9. 



2. "Birds in Their Relation to Man," Weed and Dearborn, 



pp. 177-178. 



3. "Useful Birds and Their Protection," Forbush, p. 340. 



425. Aeronautes melanoleucus: White-throated Swift. 



Knight reported that but little was known of this bird or 

 its abundance in Wyoming. Apparently it is increasing 

 and extending its range, especially in the northern portion 

 of the state, where Richard and Metz both report it. Pea- 

 body and Blackwelder also record it. It should be found 

 through central and southwestern Wyoming, but careful 

 search by Walker about Green River failed to reveal any 

 of these birds. 



TROCHILIDAE (Hummingbirds). 

 Hummingbirds are not of great economic importance. They 

 feed upon the nectar of flowers and a few insects. The young are 

 fed chiefly upon small insects. 



References : 



1. Year Book of the Department of Agriculture, 1900, p. 427. 



2. "Birds in Their Relation to Man," Ward and Dearborn, p. 



177. 



3. Farmers' Bulletin No. 506, pp. 15-17. 



432. Selasphorus platycercus: Broad-tailed Hummingbird. 



Common summer resident upon the plains and high up into 

 the mountains. 



433. Selasphorus rufus: Rufous Hummingbird. 



Knight recorded two specimens being taken. Since then 

 Metz has noted it about Sheridan, and Blackwelder found 

 it in the Teton region. 



