730 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



but pencilings on under parts less dense, the bars or transverse ver- 

 miculations less numerous and the mesial streaks less distinct." 



Adult male.— Length (skins), 146-171 (156); wing, 128-138 (132.9); 

 tail, 58-63.5 (59.7); culmen, from cere, 8.5-10 (9.5).* 



Adult female.— Length (skins), 157-177 (165); wing, 128.5-144 

 (135.2); tail, 58-67 (62.2); culmen, from cere, 8.5-10 (9.3)." 



Mountains of western North America (Sierra Nevada and Cascade 

 ranges to Rocky Mountains), Mexico, and Guatemala; northward to 

 southern British Columbia (Okanogan Lake), eastern Washington 

 (Snake River east of Pasco) and Idaho (Ketchum), thence southward 

 through Colorado (Estes Park; Boulder County; Fremont County; 

 near Mosca Pass; between Colorado City and Manitou; Bear Creek 

 Canyon, Jefferson County; Breckinridge; Glenwood Springs; near 

 Beulah, 7,200-7,800 feet). New Mexico (Big Hatchet Mountains; 

 Mimbres; Santa Fe; Iron Creek, Gila River), western Texas (Guada- 

 lupe Mountains; Presidio County), Arizona (Huachuca Mountains, 

 4,500-8,000 feet; Chiric&hua Mountains; Santa Cataliaa Mountains, 

 8,000 feet; Springerville; San Pedro River, Cochise County; Grand 

 Canyon; near Apache), California (Fort Crook; Big Trees, Calaveras 

 County; Tulare County; Raywood Flat, San Gorgordo Mountains; 



o The individual variation in this species is so great that it is somewhat difficult to 

 frame a description covering them all. The variations involve not only the general 

 color (extreme examples of the grayish phase being without a trace of cinnamomeous 

 or ochraceous color, except the partly bufty outer webs of exterior scapulars, while 

 extremes of the rufescent phase have cinnamon-brown and cinnamon-rufous the 

 predominant colors), but also the size of the darker markings on the under parts, 

 which may consist of delicate pencilings or heavy spots and bars. So far as I am able 

 to see, these variations are utterly without geographic significance, except that the 

 extreme rufous phase is, at present, known only from Guatemala, where, however, 

 specimens occur which I am unable to distinguish from northern examples. 



6 Twelve specimens. 



<= Fourteen specimens. 



