BIRDS OF COLORADO. 
II3 
636. Mniotilta varia. Black and White Warbler. 
Summer visitant; rare. An eastern species scarcely com- 
ing west of central Kansas. Has been taken twice, once by 
Minot at Boulder, June i, 1880 (B. C. N. O. V. 1880, 223), and 
Geo. F.^Breuinger writes that he took one at Table Rock, on 
the Divide between Denver and Colorado Springs. Not known 
to breed in Colorado, though breeding in corresponding lati- 
tudes in Kansas. 
644. Helminthophila virginiae. Virginia’s Warbler. 
Summer resident; common. Most common at the limit of 
its eastern extension at the base of the foothills and though so 
common there it is not known a few miles out on the plains at 
Pueblo. This is one of the few exceptions to the rule that any 
western species found in the foothills follows down the Arkan- 
sas at least as far as Pueblo. Through western Colorado it is 
abundant in migration and in many places is the most com- 
mon Warbler during the breeding season. Breeds very com- 
monly along the eastern slope of the Rocky Mountains from 
the foothills to 7,500 feet. Arrives the first week in May and 
breeds about the middle of June. Leaves the State late in 
September. 
646. Helminthophila celata. Orange-crowned Warbler. 
Summer resident; not uncommon. Quite common in 
migration, extending over the plains and a little ways into the 
mountains. Over the former it is known only as a migrant ; 
in the latter it breeds from about 6,000 to 9,000 feet, but is 
rare above 8,000 feet. Arrives the first week in May and leaves 
late in September or early October. 
646a. Helminthophila celata [lutescens. Lutescent 
Warbler. 
Summer resident ; not uncommon. The western form of 
the Orange-crowned Warbler, coming east as far as the eastern 
base of the Rocky Mountains at Denver and at Colorado Springs. 
Movements and habits so far as known the same as the Orange- 
crowned Warbler. There is no doubt that the two forms occur 
in Colorado, and that in general one inhabits eastern Colorado 
and the other western, but whether their habitats meet or over- 
lap, and their relative distribution in the mountains during the 
breeding season, are points that need further elucidation. 
647. Helminthophila peregrina. Tennessee Warbler. 
Migratory ; rare. Only known from eastern Colorado at 
the base of the Rocky Mountains, where it has been taken in 
El Paso County by Aiken, at Boulder by Minot, at Loveland by 
