358 NORTH AMERICAN BIRDS. 



(1.02), tarsus 1.58-1.66 (1.60). Sab. Southern Mexico 

 (Vera Cruz and southward). 



A. sieberii (Wagl.). Sieber's Jay. 1 

 a 2 . 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. sieberii. Sab. Highlands of Guatemala and southern Mexico. 



A. unicolor (Dtj Bus). Unicolored Jay.' 



Genus XANTHOURA Bonaparte. (Page 351, pi. XCIX., fig. 3.) 



Species. 



Common Characters. — 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 1 . 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. Eggs 2-4, 1.08 X 

 .79, pale buff or pale grayish buff, thickly speckled with umber-brown. Sab. 

 Eastern Mexico, north to lower Eio Grande Valley in Texas, south to Vera 

 Cruz and Puebla 483. X. luxuosa (Less.). Green Jay. 



a?. Lower parts chiefly or entirely primrose-yellow ; otherwise like X. luxuosa. 

 Sab. Southern Mexico (Colima, Tehuantepec, etc.), Yucatan, and Guate- 

 mala. 



X, luxuosa cyanocapilla (Cab.). Yellow-bellied Green Jay. 3 



Genus PERISOREUS Bonaparte. (Page 351, pi. XCVI., 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 sieberii Wagl., Syst. Av. 1827, Pica, sp. 23. Aphelocoma sieberi Cab., Mus. 11 em. i. 1851, 221. 



2 Oyanocurax unicolor Du Bus, Bull. Ac. Roy. Brux. xiv. pt. 2, 1847, 103. Aphelocoma unicolor Sharpe, 

 Cat. B. Brit. Mus. iii. 1877, 118. 



s Oyanocurax cyanocapillua Cab. in Tschudi Fauna Per. 1844-46, 233. Xanthura cyanocapilla Sharpe, 

 Cat. B. Brit. Mus. iii. 1877, 131. 



