226 



NORTH AMERICAN BIRDS. 



Beneath white, with a shght ochraceous tinge; cheeks, throat, and juguhim with fine 

 narrow streaks of dusky-brown ; breast, sides, and abdomen with broader longitudinal 

 stripes of clear umber (less slaty than the back), each with a darker shaft-line ; on the 

 flanks the stripes are more oval ; tibise more dingy, markings fainter and somewhat 

 transverse ; anal region and lower tail-coverts immaculate white. 



yoM?ig'/emaZe (12,023, Fort Tejon, California ; J. Xantus). Similar in general appear- 

 ance to the young male. Markings beneath broader, and slightly sagittate in form, 

 becoming more transverse on the flanks ; paler and more reddish than in the young 

 male ; tibias with brownish-rufous prevailing, this in form of broad transverse spots. 



Hab. Entire continent of North America, south to Panama; Bahamas (but not West 

 Indies, where replaced by A. frmgilloides, Vig.). 



Localities: Oaxaca (Scl. 1858, 295); Central America (Scl. Ibis, I, 218); Bahamas 

 (Bryant, Pr. Bost. Soc. VII, 1859); City of Mexico (Scl. 1864, 178); Texas, San 

 Antonio (Dresser, Ibis, 18G6, 324); Western Arizona (Coues) ; Mosquito Coast (Scl. & 

 Salv. 1867, 280) ; Costa Rica (Lawr. IX, 134). 



LIST OF SPECIMENS EXAMINED. 



National Museum, 51 ; Philadelphia Academy, 14 ; New York Museum, 7 ; Boston 

 Society, 5 ; Museum, Cambridge, 9 ; Cab. G. N. Lawrence, 1 ; Coll. R. Ridgway, 4 ; 

 Museum W. S. Brewer, 1. Total, 92. 



Measurements. 



Specimens from different regions vary but little in size. The largest are 

 4,198, 9, San Francisco, Cal., winter, 16,957, 9, Hudson's Bay Territory, and 

 55,016, 9, Mazatlan, Mexico, in which the wing ranges from 8.40 to 8.50, 

 the tail 7.00. The smallest females are 45,826, Sitka, Alaska, and 11,791, 

 Siraiahmoo, W. T., in which the wing measures about 7.80. A female 

 (32,499) from Orizaba, Mexico, one (8,513) from Fort Yuma, Cal, and 

 one (17,210) from San Nicholas, Lower California, have the wing 8.00, 

 which is about the average. The largest males are 54,336, Nulato, Alaska, 

 58,137, Kodiak, Alaska, 27,067, Yukon, mouth of Porcupine, and 55,017, 

 Mazatlan, Mexico, in which the wing measures 7.00, the tail 5.60. The 

 smallest males are 5,990, Orange, N. J., 8,514, Shoalwater Bay, VV. T., 

 21,338, Siskiyou Co., Cal., 37,428, Orizaba, Mexico, and 5,584, Bridger's 

 Pass, Utah ; in this series the wing measures 6.50 - 6.70, the tail 5.40 - 

 5.60. A specimen from Costa Eica measures : wing 6.70, tail 5.35. Thus 

 the variation in size will be seen to be an individual difference, rather than 

 characteristic of any region. Some immature specimens from the north- 

 west coast of North America (as 45,828, ^, Sitka, Eus. Am., 5,845, <?, Fort 

 Steilacoom, W. T., 11,791, Simiahmoo, Puget Sound, and 8,514, Shoalwater 

 Bay, W. T.) are much darker than others, the brown above inclining to 

 to blackish-sepia ; no other differences, however, are observable. An adult 

 from the Yukon (54,337, 9) has the rufous bars beneath remarkably faint, 

 although well defined; another (19,384, 9, Fort Eesolution), in immature 



