CHECK-LIST OF COLORADO BIRDS 339 



6'ii. Red-eyed vireo. Vireo olivaceus. Rare summer 

 resident ; an eastern species, coming only to base of foot- 

 hills ; still, one was taken at 11.000 feet. 



627. Warbling vireo. Vireo gilvus. Common summer 

 resident ; breeds sparingly on the plains ; commonly in 

 mountains up to 10,000. 



62ya. Cassins vireo. Vireo solitarius cassinii. Rare 

 or accidental summer visitor ; not known to breed ; a 

 southwestern species. 



629b. Plumbeous vireo. Vireo solitarius plumbeus. 

 Summer resident ; common ; breeds in foothills and moun- 

 tains up to over 9,000 feet. 



636. Black and •white warbler. Mniotilta varia. Rare 

 summer visitor ; two records. 



644. Virginia's •warbler. Helminthophila virgixi.e. 

 Common summer resident ; western bird, but breeds along 

 eastern base of foothills. 



64^6. Orange-cro^wned •warbler. Helminthophila cel- 

 ATA. Summer resident ; not uncommon ; common mi- 

 grant ; breeds from 6.000 to 9,000 feet. 



6-t6a. Lutescent -warbler. Helminthophila celata lu- 

 TEscENS. Summer resident ; not uncommon ; western form 

 of the orange-croAvned warbler ; ranges to eastern base of 

 mountains. 



647. Tennessee -warbler. Helminthophila peregrina. 

 Rare migrant ; eastern Colorado to base of mountains. 



648. Parula -warbler. Compsothlypis Americana. Rare 

 summer resident ; comes to base of foothills. 



652. Yellow warbler. Dendroica estiva. Abundant 

 summer resident ; breeds up to 8,000 feet. 



6o2a. Sonera yello-w warbler. Dendroica estiva so- 



