1050 U.S. NATIONAL MUSEUM BULLETIN 23 7 part 2 



Practically nothing has been published on this population's habits, 

 which are not lil^ely to differ essentially from those of the adjoining 

 populations described in detail elsewhere in this volume. 



The measurements of 34 eggs in the MCZ assigned to this race 

 average 19.3 by 14.7 millimeters; the eggs showing the four extremes 

 measure 21.1 by 14.2, 19.3 by 15.5, 17.8 by 14.8, and 19.8 by 13.2 

 millimeters. 



Distribution 



Range. — South central Yukon and British Columbia south to 

 northern Baja California, southern Arizona, and central Texas. 



Breeding range. — The Cassiar slate-colored junco breeds from south 

 central Yukon (Carcross) south to central interior British Columbia 

 (Hazelton district, Sinkut Mountain, Tupper Creek) and west central 

 Alberta (140 miles west of Edmonton). (Some hybridization between 

 this form and J. o. montanus occurs at the western and southern 

 borders of breeding range.) 



Winter range. — Winters from southern British Columbia (Van- 

 couver, Okanagan Landing, Cranbrook), Nebraska (Long Pine, 

 Lincoln), Minnesota (Minneapolis), and Wisconsin (Beaver Dam) 

 south to northern Baja California (Laguna Hanson), southern Nevada 

 (Charleston Mountains), southern Arizona (Yuma, Chiricahua Moim- 

 tains), New Mexico (Las Vegas), central Texas (Waring), and south- 

 ern Michigan (Kalamazoo, Washtenaw, and Monroe counties) ; 

 casually east to southern Ontario (Toronto), eastern New York 

 (Hastings), Massachusetts (Wellesley), Kentucky (Graves and Jef- 

 ferson counties), Virginia (Herndon, Arlington), Tennessee (German- 

 town), Georgia (Athens, Decatur, and Chatham County), Mississippi 

 (Saucier), Arkansas (Delight), and Louisiana (Catahoula Lake). 



JUNCO OREGANUS (Townsend) 



Oregon Junco * 



PLATE 59 

 Contributed by James H. Phelps, Jr. 



Habits 



To me, Oregon juncos belong to the forest "edge," particularly 

 the edge of the coniferous forest. An "edge" is that irregular mean- 

 dering border between a mountain meadow and the timber; a fading 

 woods road no longer used and now crowded with new second growth ; 

 an opening in the forest surrounding a pond or along a stream; or an 



*The following subspecies are discussed in this section: Junco oreganus montanus 

 Ridgway, J. o. shufeldti Coale, J. o. thurberi Anthony. 



