Above olivaceous-ash, interscapulars with broad streaks of dull rufous, the shafts scarcely blackish. Crown bright rufous. Wing, 2.40; tail, 2.70; bill, .29 from forehead, .20 deep; tarsus, .70; middle toe without claw, .55. _Hab._ California (and Mexico in winter?) var. _ruficeps_. Darker, above brownish-plumbeous, dorsal streaks scarcely rufous, and with distinctly black shaft-streaks; crown darker rufous. Wing, 2.40; tail, 2.60; bill, .34 and .25; tarsus, .77; middle toe, .57. _Hab._ Mexico (Orizaba; Oaxaca), in summer var. _boucardi_.[7] B. Crown streaked; interscapulars with distinct black centres; tertials sharply bordered terminally with paler. “Bridle” obsolete; bend of wing edged with yellowish. 2. P. æstivalis. Above uniformly marked with broad streaks or longitudinal blotches of deep rufous; black streaks confined to interscapulars and crown. Tail-feathers without darker shaft-stripe, and without indications of darker bars; the outer feathers without distinct white. Black marks on upper tail-coverts inconspicuous, longitudinal. The bluish-ash, and chestnut-rufous streaks above sharply contrasted; black dorsal streaks broad. Wing, 2.45; tail, 2.65; bill, .30 and .30; tarsus, .73; middle toe, .60. _Hab._ Southern States from Florida and Georgia to Southern Illinois var. _æstivalis_. The dull ash and light rufous streaks above not sharply defined; black dorsal streaks narrow. Wing, 2.65; tail, 3.00; bill, .32 and .25; tarsus, .80; middle toe, .63. _Hab._ Southern border of the Arizona region of Middle Province of United States var. _arizonæ_. Markings badly defined as in the last, but the rufous streaks darker (in summer plumage almost entirely black), with more black on the crown. Wing, 2.55; tail, 2.65; bill, .32 and .25; tarsus, .80; middle toe, .60. _Hab._ Mexico (Orizaba; Mirador, Colima) var. _botterii_.[8] 3. P. cassini. Above marked everywhere with broad short streaks of pale (not reddish) brown streaks, all black medially. Tail-feathers with distinct blackish shaft-stripe, throwing off narrow, obsolete bars toward the edge of the feathers. Outer tail-feathers distinctly tipped (broadly) and edged with dull white. Black marks on upper tail-coverts very large, transverse. Beneath nearly uniform dull white, scarcely darker along sides and across breast; flanks with broad streaks of blackish-brown. Wing, 2.55; tail, 2.80; bill, .28 and .23; tarsus, .68; middle toe, .55. _Hab._ Rio Grande, region (San Antonio and Laredo), north to Kansas (ALLEN).