AMPHISPIZA. 425 



browner on the back ; head, neck, and chest slate-grayish, paler 

 on throat and chest, darker on crown ; lores black. Male : 

 Wing 2.70-2.85 (2.75), tail 2.50-2.60 (2.56), culmen .55-.58 (.58), 

 tarsus .80-85 (.84), middle toe .55-.60 (.56). Female: Wing 

 2.50-2.65 (2.57), tail 2.30-2.45 (2.40), tarsus .80-85 (.81), middle 

 toe .55-.60 (.56). Eggs .80 X -59, dull white, speckled, chiefly 

 round larger end, with reddish brown. Hob. Guadalupe Island, 

 Lower California... 572. J. insularis Ridgw. Guadalupe Junco. 

 Sides ochraceous, or cinnamon-buff. Adult- {sexes alike) : Entire back, scapu- 

 lars, and wing-coverts nearly uniform cinnamon-brown (duller in female) ; 

 sides and top of head and neck, with hind-neck, ash-gray, the latter 

 tinged with brown ; chin, throat, and chest grayish white, the latter 

 sometimes tinged with fulvous ; upper mandible black, lower bright 

 yellow (in life) ; iris bright yellow ; wing 2.60-2.80, tail 2.60-2.80, cul- 

 men .45-.50, tarsus .80, middle toe .55. Hab. Mountains of southern 

 Lower California 571. J. bairdi Belding. Baird's Junco. 



Genus AMPHISPIZA Coues. (Page 385, pi. CIX., figs. 6, 7.) 



Species. 



a 1 . A continuous white superciliary stripe. (Above plain grayish brown, the back 

 very indistinctly streaked with darker in young only.) 



Adult (sexes alike) : Lores, chin, throat, and chest uniform black ; a malar 

 stripe (reaching not quite to bill), sides of chest, and belly, white ; sides 

 grayish, becoming browner on flanks. Young : No distinct black mark- 

 ings on head or neck ; chin and throat white, often more or less clouded 

 or flecked with grayish, the chest more distinctly marked with the 

 same ; wing-coverts and tertials light brown. Length 5.00-5.75, wing 

 about 2.60-2.75, tail 2.65-2.90. West in bushes ("sage" bushes, and 

 other desert shrubs), composed of fine thin shreds of bark, etc. Eggs 

 .71 X -54, plain greenish or bluish white. Sab. Southwestern United 

 States (from Texas to Lower California) and contiguous parts of 

 Mexico, north, in the interior, to Nevada, Utah, and western Colorado. 

 573. A. bilineata (Cass.). Black-throated Sparrow. 

 a 2 . A white supraloral spot, but no superciliary stripe. 

 ft 1 . No streaks on sides ; wing with two white bands. 

 c l . Lesser wing-coverts grayish or blackish. 



d l . Rump cinnamon-rufous ; lesser wing-coverts blackish. Adult: Up- 

 per part of throat black, the point of the chin white; fore-neck 

 and lower part of throat uniform ash-gray ; top of head gray- 

 ish, streaked with black; a broad white malar stripe; lores 

 and beneath eyes black ; sides and under tail-coverts light 

 ochraceous-cinnamon ; belly white; back brownish, broadly 

 54 



