Wyoming Birds. 67 



613. Hirundo erythtrogastra: Barn Swallow. 



Common summer resident over most of the state at the 

 lower altitudes. 



614. Iridoprocne bicolor: Tree Swallow. 



Knight said that it was summer resident ; not common and 

 distributed rather locally. This evidently is still the case, 

 as only Blackwelder, Walker, and Clearwaters have noted it. 



615. Tachycineta thalassina lepida: Northern Violet-green 



Swallow. 

 Abundant summer resident from the foothills to timber 

 line in many portions of the state. 



616. Riparia riparia: Bank Swallow. 



Abundant summer resident over most of the state. 



617. Stelgidopteryx serripennis: Rough-winged Swallow. 



Knight said that it is probably a summer resident, but that 

 the data was insufficient to mark its occurrence in Wyo- 

 ming. Blackwelder has since recorded it from the Teton 

 region. This is the only recent record. It is probable 

 that many are recorded under the preceding form which 

 should properly be placed under serripennis. 



BOMBYCILLIDAE (Waxwings). 



The Waxwings are fond of wild and cultivated fruits of vari- 

 ous kinds. They are sometimes a nuisance in cherry trees. The 

 ■ young are fed mostly on insects and their larvae, and the adults 

 are great insect destroyers. When a flock of these birds enters 

 an orchard infested by canker worms, they are. likely to rid it of 

 these pests. Elm trees are also protected from elm leaf beetles. 

 The Waxwings feed upon a variety of insects and they are great 

 gluttons, stuffing on fruit or insects until they can swallow no more. 

 They are on the whole beneficial and deserve protection. 



References : 



1. North American Fauna 19, p. 89. 



2. "Useful Birds and Their Protection,'' Forebush, pp. 209-211. 



618. Bombycilla carrula: Bohemian Waxwing. 



Knight reported that it was a winter resident and locally 

 abundant. Richard now reports that they are common 



