66 WyYoMING BIRDS. 
REFERENCES: 
1. North American Fauna No. 7, p. 108. 
North American Fauna No. 16, p. 127. 
Year Book of the Department of Agriculture, 1904, p. 242. 
“Useful Birds and Their Protection,” Forbush, pp. 262-275. 
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607. Piranga ludoviciana: Western Tanager. 
Fairly common summer resident over the middle altitudes 
of the state. 
608. Piranga erythromelas: Scarlet Tanager. 
“Accidental. But a single specimen has been reported from 
Wyoming. Mr. Frank Bond took one at Cheyenne on 
May. 28th, 1889. The skin is in his collection. It is a male 
bird, in gorgeous plumage, and was alone.” (Knight.) 
HIRUNDINIDAE: (Swallows). 
The Swallows spend much time on the wing. Their habit of 
fying above meadows in search of insects is well known to all. 
They are almost entirely insectivorous during the summer months. 
They destroy enormous numbers of injurious insects, as well as 
some beneficial species. Their long pointed wings and wide gapes 
adapt them well to their mode of life. They feed upon mosquitoes, 
flies, gnats, moths, and various beetles, including the June beetles 
and striped cucumber beetle. 
The government has issued a bulletin urging the protection of 
Swallows because they destroy the cotton boll weevil during migra- 
tions. 
REFERENCES: 
1. “Value of Swallows as Insect Destroyers,” Biological Sur- 
vey Circular No. 56. 
Year Book of the Department of Agriculture, 1910, p. 418. 
Farmers’ Bulletin No. 54, pp. 36-38. 
“Useful Birds and Their Protection,’ Forebush, pp. 343-348. 
Reh 
611. Pregne subis subis: Purple Martin. 
Peabody reports this from the eastern portion of the state. 
Knight recorded it also. 
612. Petrochelidon lunifrons lunifrons: Cliff Swallow. 
Exceedingly abundant summer resident over the lower or 
middle altitudes of the state. 
