CHECK-LIST OF COLORADO BIRDS 339 



624. 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. 



629a. Cassin's 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 VIRGINIA. 

 Common summer resident ; western bird, but breeds along 

 eastern base of foothills. 



646. Orange-crowned warbler. HELMINTHOPHILA CEL- 

 ATA. Summer resident ; not uncommon ; common mi- 

 grant ; breeds from 6,000 to 9,000 feet. 



646a. Lutesceiit warbler. HELMINTHOPHILA CELATA LU- 

 TESCENS. Summer resident ; not uncommon : western form 

 of the orange-crowned 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. 



652a. Sonera yellow warbler. DENDROICA ^ESTIVA so- 



