Blue-black all over; female lighter and streaked with grayish-white below; often nests in bird houses; twittering song. *Tree Swallow.

*Chimney Swift.

82. YELLOW-BREASTED CHAT. 7-1/4 in.

(Icteria virens. 683.)

Olive-green; bright yellow below, belly _white_; region about eye black, marked with a white line above eye; white spot and shorter line below eye; the largest warbler; remarkable song. *d.i.c.kcissel. *Western Yellow-Throat. *Yellow-Throated Vireo.

83. BLACK-THROATED BLUE WARBLER. 5-1/4 in.

(Dendroica caerulescens. 654.)

Slaty-blue; below white, with black throat and sides; _conspicuous white patch on wing_; female grayish, no black, but may be recognized by _wing patch_; _hoa.r.s.e_ note, "kree, kree." *Blue-gray Gnatcatcher.

84. NASHVILLE WARBLER. 4-3/4 in.

(Helminthophila rubricapilla. 645.)

Olive-green; head and neck bluish gray; indistinct brown patch on crown; _bright yellow below_; no wing bars; _white eye ring_; song, not loud, "wee'-see, wee'-see, wit'-a-wit'-a-wit'." *Tennessee Warbler.

85. WARBLING VIREO. 5-1/4 in.

(Vireo gilvus. 627.)

Mouse gray, with olive rump; white below, tinged with greenish yellow; creamy-white around the eye; song, rippling warble. *Red-eyed Vireo.

*Least Flycatcher.

86. BLUE-HEADED VIREO. 5-1/2 in.

(Vireo solitarius. 629.)

Olive-green; _ashy-blue head_; pure white below, sides yellowish; line around the eye and to the bill, white; two white wing-bars; song, noteworthy. *Yellow-throated Vireo.

87. ORCHARD ORIOLE. 7 in.

(Icterus spurius. 506.)

Male, rich _chestnut-brown_ with black head, wings and tail, narrow white wing-bar; female olivaceous above and greenish-yellow below with two white wing-bars; young male like female but with black throat; high trees; loud, clear song. *Baltimore Oriole.

88. LONG-BILLED MARSH WREN. 5-1/4 in.

(Telmatodytes pal.u.s.tris. 725.)

Brown, almost black on head, tail and between shoulders, the latter streaked with white; barred only on wings and tail; _line over eye_ and middle of breast white; _long bill_; spluttering song. *Other Wrens.

89. BAY-BREASTED WARBLER. 5-1/2 in.

(Dendroica castanea. 660.)

Ashy-brown, black-streaked; black cheeks and forehead; throat, upper part of breast, sides and crown, _rich chestnut brown_; white wing-bars.

*Chestnut-sided Warbler.

90. PARULA WARBLER. 4-1/2 in.

(Compsothlypis americana. 648.)

Grayish-blue, _yellowish across the back_; throat and breast yellow, latter crossed by brownish band; wing-bars; peculiar song. *Blue Golden-winged Warbler.

91. WOOD PEWEE. 6-1/4 in.

(Contopus virens. 461.)

Dark olive-brown; brownish black on wings and tail; frowsy head; below white, showing olive tinge on sides; two narrow white wing-bars; plaintive note repeated slowly and often, "pee'to-way', pee'-to-way', hee'-rue." *Phoebe. *Least Flycatcher.

92. BOBOLINK. 7-1/2 in.

(Dolichonyx orizivorus. 494.)

Male black with light back, creamy buff on neck; female, sparrow colored, streaked above; long merry musical song; open fields; in Lincoln Park usually seen in flocks flying overhead, singing on the wing.

93. BLUE GOLDEN-WINGED WARBLER. 5 in.

(Helminthophila chrysoptera. 642.)

Blue-gray; crown and _patch on wing_, golden yellow; _throat_, and stripe through eye, _black_; white below; song, drawling "zee, zee, zee, zee."

*Parula Warbler.

94. INDIGO BUNTING. 5-3/4. in.

(Cyanospiza cyanea. 598.)

_Indigo blue_; wings and tail blackish; female brown; in flocks; often feeds in the gra.s.s; noteworthy song. *Bluebird.

95. PROTHONOTARY WARBLER. 5-1/4 in.

(Prothonotaria citrea. 637.)

Entire head, neck and breast, _bright orange yellow_; blue-gray wings, rump and tail; female duller; prefers shrubbery near water. *Blackburnian Warbler. *Yellow Warbler.

96. TENNESSEE WARBLER. 4-1/2 in.

(Helminthophila peregrina. 647.)

Olive-green, brightest on rump; head and neck, blue gray; _dull white below_; faint white line over eye; no wing-bars; song, shrill and feeble.

*Nashville Warbler.

97. MOURNING WARBLER. 5-1/2 in.

(Geothlypis philadelphia. 679.)