BIRDS OF NORTH AND MIDDLE AMERICA. 203 



Range. — Great Plains of North America. (Monotypic.) 

 This genus is unquestionably far more nearly related to Cotumicu- 

 lus than to Passerculiis, but differs from it in the characters mentioned 

 above; both Oentronyx and Coturniculus differing from Passercuhis in 

 additional characters which they share together (see "Key" to the 

 genera, pages 34, 35). 



CENTRONYX BAIRDII (Audubon). 

 BAIRS'S SFARBOW. 



Admits {sexes alike). — Head ochraceous or buffy, deepest on pileum, 

 palest (often nearly or quite white) on chin and throat; pileum streaked 

 with black, especially laterally; a blackish rictal streak, and a black 

 submalar streak; prevailing color of upper parts light brown, varied 

 by blackish central spots and buffy edgings to the feathers; under 

 parts white or pale buffy, the chest, sides, and flanks streaked with 

 black; bill brownish, the mandible paler (pale flesh color in life); iris 

 brown; legs pale brownish yellow (pale flesh color in life), the toes 

 and claws darker. 



Young. — Essentially like adults, but feathers of pileum and back 

 dusky distinctly margined with pale buffj^, and streaks on chest, etc., 

 less sharply defined. 



Adult mffife.— Length (skins), 121.92-137.16 (128.02); wing, 71.12- 

 72.64 (71.63); tail, 62.07-63.34: (53.83); exposed culmen, 10.4:1-10.92 

 (10.67); depth of bill at base, 6.60-6.86 (6.73); tarsus, 20.32-21.08 

 (20.67); middle toe, 15.24r-16.76 (15.76).^ 



J.(^MZi;/emaZe.— Length (skins), 118.11-125.73(122.17); wing, 66.04- 

 68.58 (67.56); tail, 48.26-53.34 (51.56); exposed culmen, 10.16-10.67 

 (10.41); depth of bill at base, 6.60-7.37 (6.86); tarsus, 19.30-20.32 

 (19.81) middle toe, 14.73-15.24 (14.99).' 



Great Plains of North America; breeding from western Minnesota 

 (Red River Valley), North Dakota, eastern Montana, etc.,' noi-th to 

 Assiniboia and Manitoba (Carberry, Fingerboard, Shell River, Butte 

 River, Moose Mountain, Lower Saskatchewan, Shoal Lake, etc.) ; south, 

 during migration to Texas, New Mexico, Arizona, northern Chihua- 

 hua, (Parral, Balleza, etc.), and northern Sonora (Sasabe, Nuevenche 

 plain, etc.); west casually to eastern Washington (Okanogan County, 

 September). 



' Eight specimens. 



^ Five specimens. 



^Two alleged breeding localities are so far outside the really established breeding 

 range of this species that I can only refer to them as doubtful. These are, Camp 

 Harney, eastern Oregon (Bendire, Proc. Bost. Soc. N. H., 1877, 118), and Canoncito, 

 northern Texas (McCauley, Bull. U. S. Geol. and Geog. Surv. Terr., iii, 1877, 663). 



