50. HENSLOW SPARROW. 5 in.

(Coterniculus henslowii. 547.)

Back conspicuously marked and streaked, showing much chestnut; head and neck a peculiar greenish tinge, _finely_ lined with black; below tinged with buff and finely streaked; dark stripes and spots on sides of head; _sharp tail_; hides in the gra.s.s and can be carefully observed only with patience.

51. GRINNELL WATER-THRUSH. 5-3/4 in.

(Seiurus noveboracensis notabilis. 675a.)

Very dark olive-brown; below yellowish white, thickly streaked; _pale stripe_ over the eye; skulks along the very edge of the water; _tilts its tail_; brilliant song. *Louisiana Water-Thrush. *Ovenbird. *Palm Warbler.

52. CATBIRD. 8-3/4 in.

(Galeoscoptes carolinensis. 704.)

Slate-gray; bill, crown and tail, black; chestnut patch under tail; about shrubbery; willing to be looked at; calls like a cat; song, greatly varied.

53. PINE WARBLER. 5-3/4 in.

(Dendroica vigorsii. 671.)

Olive-green; yellow breast; sides of head suffused with yellowish--sometimes forming a _yellow line over eye_; two dull white wing-bars; song, a loud, penetrating trill. *Yellow-bellied Flycatcher.

*Female Western Yellow-throat. *Female Wilson Black-cap.

54. RED-BREASTED NUTHATCH. 4-3/4 in.

(Sitta canadensis. 728.)

Bluish-gray; crown and _stripe through eye, black_, with a white line over the eye; _below rusty-red_, throat white; climbs up and down and around trees; note, "cark, cark, cark." *White-breasted Nuthatch.

55. BLACK AND WHITE CREEPER. 5-1/4 in.

(Mniotilta varia. 636.)

Black and white, _striped_; white belly; female shows more white below; creeps up and down trees like the _Nuthatches_; song rapid and rasping, "he'-ho, he'-ho, he'-ho." *Black-poll Warbler.

56. BLACK-THROATED GREEN WARBLER. 5-1/4 in.

(Dendroica virens. 667.)

Olive-green; _bright yellow cheeks_; _throat and upper part of breast, black_; white wing-bars; song, repeated often and rapidly, "chee, chee, chee, chee, char, chee." *Cape May Warbler. *Hooded Warbler.

57. RED-HEADED WOODp.e.c.k.e.r. 9-1/2 in.

(Melanerpes erythrocephalus. 406)

Black and white, not streaked; _entire head, neck and upper part of breast, crimson_; pure white belly; note, a loud "kr-r-r-r r."

*Red-bellied Woodp.e.c.k.e.r.

58. MOCKINGBIRD. 10 in.

(Mimus polyglottus. 703.)

Ashy-gray, wings and tail darker; whitish below; wing shows white patch; outer tail-feathers white; famous for its song. *Loggerhead Shrike.

*Cuckoos. *Catbird.

59. CHIMNEY SWIFT. 5-1/4 in.

(Chaetura pelagica. 423.)

Dark sooty-gray; _bob-tail_; long, pointed wings, which often vibrate rapidly in flight; twittering note; never seen perching like other birds.

*Swallows.

60. OLIVE-BACKED THRUSH. 7-1/4 in.

(Hylocichla ustulata. 758a.)

_Uniform dark olive_; below white, darker on sides; cheeks, throat, breast and ring about eye, buff; spotted on breast; noteworthy song.

*Gray-cheeked Thrush. *Hermit Thrush. *Wilson Thrush.

61. GREAT-CRESTED FLYCATCHER. 9 in.

(Myiarchus crinitus. 452.)

Olive, showing rusty brown on wings and tail; _crested head_; throat and breast, ashy-gray; wing-bars; belly sulphur-yellow; usually perches high; note, "loud whistle." *Blue Jay.

62. LOUISIANA WATER-THRUSH. 6-1/4 in.

(Seiurus motacilla. 676.)

Olive; white below, buff-tinged posteriorly and streaked, but not thickly, with dusky; _throat and middle of belly, unmarked_; _white_ line over eye; loud, ringing song. *Grinnell Water-Thrush. *Ovenbird. *Palm Warbler.

63. LEAST FLYCATCHER. 5-1/4 in.

(Empidonax minimus. 467.)

Olive-gray; wings, tail and head, darker; two narrow wing-bars; decidedly grayish below, whiter on throat; _jerks its tail_ and utters a sharp, energetic call, "che-bec'." *Wood Pewee. *Phoebe.

64. WOOD THRUSH. 7-3/4 in.

(Hylocichla mustelina. 755.)

_Bright brown on head_ shading to olive-brown on rump and tail; white beneath, with conspicuous _round_ spots except on throat and middle of belly; remarkable song. *Other Thrushes. *Fox Sparrow.

65. WESTERN YELLOW-THROAT. 5-1/4 in.

(Geothlypis trichas occidentalis. 681a.)

Olive-green, showing brownish tinge; _broad, black stripe across forehead and through eye_; bordered broadly with white; yellow beneath; _female_ duller and without black stripe and easily confused with female _Mourning_, _Connecticut_ and _Pine Warblers_; in low bushes; song, "witch-i-ty, witch-i-ty, witch-i-ty."