ains.

622a. =White-rumped shrike.= LANIUS LUDOVICIANUS EXCUBITORIDES. Common
summer resident; breeds mostly on the plains; sometimes in mountains up
to 9,500 feet.

624. =Red-eyed vireo.= VIREO OLIVACEUS. Rare summer resident; an eastern
species, coming only to base of foothills; 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 mountains up to over 9,000 feet.

636. =Black and white warbler.= MNIOTILTA VARIA. Rare summer visitor;
two records.

644. =Virginia's warbler.= HELMINTHOPHILA VIRGINIAE. Common summer
resident; western bird, but breeds along eastern base of foothills.

646. =Orange-crowned warbler.= HELMINTHOPHILA CELATA. Summer resident;
not uncommon; common migrant; breeds from 6,000 to 9,000 feet.

646a. =Lutescent warbler.= HELMINTHOPHILA CELATA LUTESCENS. 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 AESTIVA. Abundant summer resident;
breeds up to 8,000 feet.

652a. =Sonora yellow warbler.= DENDROICA AESTIVA SONORANA. Summer
resident; probably common; to the southwest _aestiva_ shades into
_sonorana_.

654. =Black-throated blue warbler.= DENDROICA CAERULESCENS. Rare migrant;
one record.

655. =Myrtle warbler.= DENDROICA CORONATA. Common migrant; scarcely
known west of the range.

656. =Audubon's warbler.= DENDROICA AUDUBONI. Abundant summer resident;
breeds from 7,000 to 11,000 feet.

657. =Magnolia warbler.= DENDROICA MACULOSA. Rare migrant; breeds
northward.

658. =Cerulean warbler.= DENDROICA RARA. Rare migrant; one record.

661. =Black-poll warbler.= DENDROICA STRIATA. Rare summer resident;
sometimes common in migration; one breeding record for the State--at
Seven Lakes; altitude, 11,000 feet.

664. =Grace's warbler.= DENDROICA GRACIAE. Summer resident; common in
extreme southwestern part of the State.

665. =Black-throated gray w