100 



ISTo. 42,074, Mirador, Mexico, is extremely similar to the last, but 

 lacks the ashy tinge on the side of the breast. Wing, 8.85 ; tail, 

 7.80; culmen, 0.65; tarsus, 2.40; middle toe, 1.45. Another Mirador 

 specimen (No. 23,809) is exactly similar; it measures: wing, 9.40 ; tail, 

 8.10; tarsus, 2.30; middle toe, 1.45 — nearly the same as the Washing- 

 ton specimen. 



No. 5,841, Puget Sound, October 4, is exactly similar to No. 6,874 

 {Sacramento Valley), and has, like it, the forehead strongly tinged with 

 dull rusty. Wing-, 8.90; tail, 8.00; culmen, 0.62; tarsus, 2.45 ; middle 

 toe, 1.55. 



The adult females differ pretty constantly from the males in the much 

 browner upper parts and rusty instead of ashy nape and auriculars, 

 though this last feature is a less constant distinction. 



No. 26,588, Washington, D. C. : — Similar to the male, but the upper 

 parts lacking entirely any bluish cast, and the rufous of the lower parts 

 less vinaceous in tint. Forehead tinged with rusty-brown; neck and 

 auriculars uniform dull rufous, with a rusty-brown tinge, and sides of 

 thebreast entirely destitute of ashy wash. Wing, 10.80; tail, 9.00; cul- 

 men, 0.75; tarsus, 2.65; middle toe, 1.85; fourth and fifth quills equal 

 and longest ; third longer than sixth ; second intermediate between 

 sixth and seventh ; first three inches shorter than the longest. 



No. 57,867, Tehuantepec, Southern Mexico (January 8, 1869), is exactly 

 like No. 20,588, except that the tibi;e are deeper and nearly uniform 

 Tufous. Wing, 10.35; tail, 9.40; culmen, 0.70; tarsus, 2.80; middle toe, 

 1.70. 



No. 55,018, Mazatlan, Western ^lexico (February 21), differs in having 

 the rufous bars of the lower par^s browner, more sharply defined, and 

 more regularly transverse. Wing, 10.10; tail, 9.30; culmen, 0.75 ; tar- 

 sus, 2.65 ; middle toe, 1.60. 



Two other specimens (No. 5,792, South Carolina, and No. 49,682, Ari- 

 zona) are very similar in colors to the last ; their measurements may be 

 found in the appended table. 



The following detailed descriptions of young birds are of specimens 

 typical of the two supposed geographical styles : — 



Young male (55,498, Fort Macon, N. C, February; Dr. Coues. Type 

 of var. cooper i in Hist. N. Am. Birds, iii, p.' 231) : — Above gray- 

 ish-umber, the feathers of forehead, crown, and nape faintly edged 

 with pale rusty ; occiput unvaried blackish, feathers white beneath the 

 surface. Wing-coverts, scapulars, and interscapulars narrowly bordered 

 with pale yellowish-umber ; rump and upper tail-coverts bordered with 

 rusty. Tail paler and grayer than the back, narrowly tipped with white, 

 and crossed by four bands of brownish-black, the first of which is only 

 partially concealed. Scapulars and upper tail-coverts showing much 

 concealed white, in form of roundish spots, on both webs. Beneath, 

 clear white, without any yellowish tinge ; throat with a medial and lat- 

 eral series of clear dark-brown streaks; jugulum, breast, sides, flanks, 

 and abdomen with numerous stripes of clear sepia, each showing a 

 darker shaft-streak ; tibite with longitudinal streaks of paler and more 

 rusty brown; lower tail-coverts immaculate. 



Young female (6876, "Sacramento Valley, Cal."; Dr. Heermann — 

 probably from Pennsylvania. Type of var. cooperi in Hist. N. Am. B., 

 iii, p. 231) : — Similar to young male, but more varied. The black mid- 

 dle streaks of feathers of head above narrower, causing more conspicu- 

 ous streaks ; white spots of scapular region considerably exposed ; lon- 

 gitudinal stripes beneath narrower and more sparse. 



Young male (Fort Tejon, Cal., type of var. mexicamis, torn. cit. 232) : 



