748 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



ee. Back dull greenish blue; black of chest abruptly defined against the dull 

 greenish blue of breast, etc.; throat pure white. 

 /. White band along side of crown and occiput confluent (or nearly so) 

 posteriorly with white throa1>patch; crown, occiput, and hindneck 

 black. (Mountains of Guerrero, southwestern Mexico. ) 



Cyanolyca mirabilis, adults (p. 748) 

 ff. White band along side of crown and occiput terminating at end of 

 auricular region; crown, occiput, and hindneck dull greenish or 

 bluish slate color (practically concolor with back). 



Cyanolyca mirabilis, young (p. 748) 



dd. Pileum grayish purplish blue, concolor with back; neither adults nor 



young with a white or light blue band across fore part or along side of 



crown; chest grayish purplish blue, slightly dusky next to the pale 



grayish blue throat-patch. (Southeastern Mexico. ) 



Cyanolyca nana (p. 320) 



Page 320: Interpolate, after Cyanolyca argentigula: 



CYANOLYCA MIRABILIS Nelson. 

 OMILTEUE JAY. 



Adults {sexes alike). — Head, neck, and chest black, abruptly defined 

 posteriorly; a narrow and very sharply defined band of white across 

 anterior part of crown, continued backward at extremities in a stripe 

 along each side of crown and occiput, deflected downward immediatelj'^ 

 behind auricular region, across sides of neck, nearly or quite " to the 

 large patch of pure white covering entire throat; rest of plumage uni- 

 form dull grayish greenish blue, * the under surface of remiges and 

 rectrices slaty black, their shafts deep black; bill, legs, and feet black. 



Young. — Similar to adults, but crown, occiput, and hindneck dull 

 greenish or bluish slate color, only slightly darker than and practically 

 concolor with the color of back, etc. ; white stripe on side of crown 

 and occiput not continued (at least not distinctly so) across side of neck; 

 under parts of body slate color, more bluish on breast, the black of 

 chest much narrower and less sharply defined posteriorly than in adults. 



Adult male.— Length, (skins), 138-147 (142); wing, 104.5-109 (107.2); 

 tail, 109-116 (113.3); exposed culmen, 22-23.5 (22.8); depth of bill at 

 nostrils, 9; tarsus, 32-33.5 (32.8); middle toe, 18." 



Adult female.— Leagth. (skins), 120-135 (127.5); wing, 101-102 

 (101.5); tail, 105-109 (107); exposed culmen, 21; depth of bill at nos- 

 trils, 8; tarsus, 31; middle toe, 16.5-17 (16.7). <« 



Mountains of soutliwestern Mexico, in State of Guerrex'o (Omilteme). 



Cyanolyca mirabilis Nelson, Proc. Biol. Soc. Wash., xvi, Nov. 30, 1908, 154 

 (Omilteme, Guerrero, s. w. Mexico; coll. U. S. Nat. Mus.). 



« Mr. Nelson informs me that in life and before skinning this stripe and the white 

 throat-patch are really confluent; in the skins examined they appear not quite so. 



b The color decidedly darker and duller than the china blue of my Nomenclature 

 of Colors. 



"Three specimens. 



'^ Two specimens. 



