320 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult male.^ljength (skins), 250-255 (252.2); wing, 122-125 (123); 

 tail, 130-131 (130.5); exposed culmen, 22.5-26 (24.2); depth of bill at 

 nostrils, 9.5-10 (9.T); tarsus, 35-36 (35.5); middle toe, 20.5-21 (20.7).« 



Adult fc/nale.— Length (skins), 245-250 (247.2); wing, 117.5-124 

 (119.8); tail, 125.5-131 (128.5); exposed culmen, 23-24 (23.5); depth 

 of hill at nostrils, 10-10.5 (10.2); tarsus, 34.5-36 (35.2); middle toe, 

 18.5-19.5 (19.2).'' 



Eastern Costa Rica (Talamanca; Volcan de Irazu) and Chiriqui (Vol- 

 can de Chiriqui, Caribbean slope, 7,000 to 9,000 feet). 



Ci/anocitta argeidigida LiAWRE^CE, Ann. Lye. Nat. Hist. N. Y., xi, Feb., 1875, 

 88 (Talamanca, Costa Rica; coll. U. S. Nat. Mus. ). — Sclater and Salvin, 

 Proc. Zool. Soe. Lond., 1876, 268 (crit. ). — Zeledon, Cat. Aves de Costa 

 Eica, 1882, 10. 



Cyanocorax argeniigula SuARPE, Cat. Birds Brit. Mus., iii, 1877, 128. — Zeledon, 

 Anal. Mus. Nac. Costa Rica, i, 1887, 113 (Faldas de Volcan de Ira/Ai). — 

 RiDGWAY, Proc. U. S. Nat. Mus., xi, 1889, 541 -(Irazu; descr. adults and 

 young; crit.). 



Cyanolyca argentigula Salvin and Godman, Biol. C'entr.-Aiu. , Aves, i, Apr., 

 1887, 501, pi. 34.— Bangs, Proc. New Engl. Zool. Clul?, iii, 1902, 57 (Volcan 

 de Chiriqui, 9,000 ft.). 



CYANOLYCA NANA ( Du Bus). 

 DWARF JAY. 



Adult male. — Above plain grayish blue, brighter and more purplish 

 blue on pileum, the forehead and a narrow stripe thence backward 

 above upper margin of the black orbital and auricular patch more or 

 less distinctly, ])ut not abrupt!}", paler (iiax-liower) blue; chin, nasal 

 tufts, and entii'e loral, orbital, auricular, and malar regions uniform 

 black, forming a conspicuous and sharply defined patch co\'ering 

 sides of head; entire throat pale grayish purplish blue (purplish pearl 

 blue); remaining under parts dull graj^ish blue, paler posteriori}^, 

 darker anteriorly, deepening on upper chest (next to pale bluish 

 throat-patch) into dusky blue; under surface of wings and tail sooty 

 slate color; bill, legs, and feet black; length (skins), 213.. 5-236 (224.5); 

 wing, 109-117.5 (113); tail, 110.5-117.5 (112.5); exposed culmen, 

 17.5-20.5 (18.5); depth of bill at nostrils, 7-8 (7.5); tarsus, 30.5-33 

 (32); middle toe, 15-18 (17).« 



Adult female. — Similar to adult male, but smaller and didler in 

 color; length (skin), 208; wing, 107; tail, 106.5; exposed cidmen, 

 16.5; depth of bill at nostrils, 7; tarsus, 28.5; middle toe, 15. '^ 



Young. — Similar to adult female, but with the pale throat-patch 

 much less distinct and more restricted, shading gradually posteriorly 



«Two specimens, from Volcan de Chiriqui (Caribbean slope). 



''Three specimens; two from Volcnn di' Chiriqui, one from Talamanca, Costa Rica. 



'^'Five specimens. 



<^ One specimen. 



