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). Hggs .80 x .59, dull white, speckled, chiefly 
round larger end, with reddish brown. Hab. Guadalupe Island, 
Lower California... 572. J. insularis Rinaw. 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...........ceseseee 571. J. bairdi Betpina. Baird's Junco. 
Genus AMPHISPIZA Cours. (Page 385, pl. CIX., figs. 6, 7.) 
Species. 
a, 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. Nest in bushes (“sage” bushes, and 
other desert shrubs), composed of fine thin shreds of bark, ete. Eggs 
‘71 X .54, plain greenish or bluish white. Hab. 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, A white supraloral spot, but no superciliary stripe. 
b. No streaks on sides; wing with two white bands or else sides deep slate-gray. 
ce. Lesser wing-coverts grayish or blackish. 
d', 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 
64 
