HIKDS OF NORTH AND MIDDLK AMERICA. 311) 



KEY T(J TllK Sl'ICClKS AM) SI HSI'KCIES OK CYANOLYCA. 



a. Throat bluish ur silvery, abruptly contrasted 1)oth with 1)la(:k on sides of head 

 and color of chest. 

 //. Chest bicolored (blue, crossed above l)y a baml oi' black or white). (.South 



American si)ecies, except C. pulchra.) 

 hi). Chest unicolored (brown, black, or dull grayish blue). 

 t: Back and chest sooty brown; whole crown very pale blue or bluish white; 



throat i)urplish blue. {Cyanolyca pulchra.«') 

 re. Back and chest black or blue; only part of the crown (if any) bluish; tliroat 

 silvery white or pale purplish l)lue. 

 d. Pileuni and back black or dusky blue; chest l)lack; depth of bill at nostrils 

 9 or more. ( Ilifjhlands of Costa Rica, Chiriqui, and Yeragua.) 



Cyanolyca argentigula (p. 319) 

 (/(/. Pileum, buck, and chesl blue; depth of bill at nostrils not more than 8. 



(Southeastern Mexico. ) .Cyanolyca nana ( p. 320) 



an. Throat black or very dark blue, not abruptly contrasted (sometimes concolor) 

 with black of sides of head and color of chest. 

 h. Bill slender (depth at nostrils not more than 10); chest and hindneck blue; 

 crown and occiput purplish blue, like hindneck. ((Tuatemala; State of Chi- 

 apas, southern Mexico. ) - Cyanolyca pumilo (p. 321 ) 



U>. Bill stouter (depth at nostrils not less than 10.5) ; chest and hindneck black; 

 crown and occiput azure blue, abruptly defined. 

 c. Light blue occipital patch margined laterally with white; neck brownish 1)lack 

 or blackish brown. (Southern Mexico; Guatemala.) 



Cyanolyca mitrata (j). 322) 



«'. Light blue occipital i)atch not margined laterally with white; neck black. 



(Highlands of Costa Rica and Chiriqui. ) Cyanolyca cucuUata (p. 323) 



CYANOLYCA ARGENTIGULA (Lawrence). 

 SILVERY-THROATED JAY. 



Adidts {seweH id Ike). — Head, neck, and chest black: anterior portion of 

 crown crossed by a band (about 6.3-7.6 wide) of pale orayish lavender 

 or silvery Avhite, extending- from each extremity backward in a nar- 

 row stripe, alonq- each side of the crown and occiput to about the end 

 of the auricular region, the posterior portion of this streak of a 

 deeper lavender hue; entire throat (but not chin) pale lavender or 

 silvery white, forming a very conspicuous, shar]>ly defined patch, 

 broader at its posterior extremity, where very sharply detined, with a 

 convex outline; lower back, scapulars, rump, upper tail-coverts, and 

 under ])arts posterior to chest dusky purplish blue, gradually shading 

 into the l)lack anteriorly; wings and tail dull smalt or cyanine blue, 

 tlieir under surface grayish black; bill, legs, and feet black. 



}^)?///V.--Sin^ilar to the adults, but the lavender marking on top of 

 head wanting or l)ut slightly indicated, the whole crown and occiiMit 

 being dusky purplish blue. 



aCyanocitla pulchra Lawrence, Ann. Lye. Nat. Hist. N. Y., xi. 187.") (pub. Feb., 

 1876), 163 (Quito, Ecuador; coll. G. N. Lawrence).— Sclater and Salvin, Proc. Zool. 

 Soc. Lend., 1876, 272 (crit. ).— Taczanowski and Berlepsch. I'nx'. /.ool. Sof*. Lond., 

 1885, 116 (Quito). 



