50 WyYoMINnc Birps. 
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. 
“Birds in Their Relation to Man,’ Ward and Dearborn, p. 
IVE 
3. Farmers’ Bulletin No. 506, pp. 15-17. 
LS) 
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. 
