358 NORTH AMERICAN BIRDS. 
(1.02), tarsus 1.58-1.66 (1.60). Hab. Southern Mexico 
(Vera Cruz and southward). 
A. sieberii (WaAGL.). Sieber’s Jay.! 
a®, Lower parts entirely uniform rich blue, like upper parts. 
Plumage entirely uniform rich azure-blue, except lores, which are deep — 
black, and under surface of wings and tail, which are dull black; size of 
A. sieberit. Hab. Highlands of Guatemala and southern Mexico. 
A. unicolor (Du Bus). Unicolored Jay.? 
Genus XANTHOURA Bonaparte. (Page 351, pl. XCIX., fig. 3.) 
Species. 
Common CuHaracters.—Adults uniform bright green above, becoming more 
bluish toward tips of middle tail-feathers; nasal tufts, triangular patch covering 
anterior portion of malar region (reaching upward to eye), and whole top of head 
(except anteriorly), rich campanula-blue; anterior part of forehead white, changing 
gradually into blue of crown; tail, except four middle feathers, pure primrose-yel- 
low; sides of head (except as described above), chin, throat, and chest, uniform deep 
black, with abrupt semicircular outline against breast; rest of under parts light 
green or yellow. Young: Similar to adult, but colors duller, the blue of crown 
tinged with green, white of forehead stained with, or replaced by, yellow, black of 
head much duller, and lower parts pale creamy yellow. 
a’. Lower parts pale verdigris-green, more or less tinged, especially beneath sur- 
face, with pale primrose-yellow; length 11.00-12.00, wing 4.40-4.80, tail 5.10- 
5.80. West in small, usually thorny, trees or in thickets. Hggs 3-5, 1.08 x 
.80, pale buff or pale grayish buff, thickly speckled with umber-brown. Hab. 
Eastern Mexico, north to lower Rio Grande Valley in Texas, south to Vera 
Cruz and Pueblau........cceceeeeeseeeeeeeees 483. X. luxuosa (Less.). Green Jay. 
a, Lower parts chiefly or entirely primrose-yellow; otherwise like Y. luxuosa. 
Hab. Southern Mexico (Colima, Tehuantepec, etc.), Yucatan, Guatemala, and 
Honduras. 
‘X. luxuosa cyanocapilla (CaB.). Yellow-bellied Green Jay. 
Gznus PERISOREUS Bonaparte. (Page 351, pl. XCVL,, fig. 3.) 
Species. 
Common CHaracters.—Adults with forehead, nasal tufts, sides of head, throat, 
and chest white, or whitish ; occiput (sometimes nearly whole top of head) grayish, 
dusky, or blackish ; upper parts uniform dusky grayish or brownish, the tail-feathers 
1 Pica sicberii Wact., Syst. Av. 1827, Pica, sp. 23. Aphelocoma sieberi Cas., Mus. Hein. i. 1851, 221. 
* Cyanocorax unicolor Du Bus, Bull, Ac. Roy. Brux. xiv. pt. 2, 1847, 103. Aphelocoma unicolor SHARPE, 
Cat. B. Brit. Mus. iii. 1877, 118, 
3 Cyanocorax cyanocagillus Caz. in Tschudi Fauna Per. 1844-46, 233, Xuanthura cyanocapilla SHARPE, 
Cat. B. Brit. Mus. iii. 1877, 131. 
