284 NORTH AMERICAN BIRDS. 



Superciliary streak sliarply defined, conspicuous. Wing, 5.00; 

 tail, 5.60; bill, 1.20 and .37; tarsus, 1.55; middle toe, .95. Wing- 

 formula, 4, 5, G, 7, 3, 8, 9, 2, 10 ; first, 2.10 shorter than longest. 

 Graduation of tail, 1.15. Hab. Pacific Province of United States ; 



Capo St. Lucas var. cali/urnica. 



B. Tail not longer than wings, or considerably shorter. No superciliary 

 stripe, and no streaks on throat or jugulum. Auriculars blue like the crown. 



C ultramarina. Lower parts whitish, conspicuously different from the 

 upper. 



Tail nearly, or perfectly even. 



Length, 13.00; tail even ; bill, 1.50; tail, 7.00. ffab. Mexico. 



var. ultramarina.^ 



Length, 11.50; tail very slightly rounded (graduation, .25 only); 

 bill, 1.28 and .35; tail, 50. Above bright blue, dorsal region 

 obscured slightly with ashy ; beneath dull pale ash, becoming 

 gradually whitish posteriorly, the crissum being pure ash. Lores 

 blue. Tarsus, 1.45 ; middle toe, .95. Wing-formula, 5, 4^6, 7, 

 3, 8, 9, 10, 2 ; first, 2.10 shorter than loPirest. Graduation of tail, 

 .25. Hab. Lower Rio Grande var. couchi. 



Tail considerably rounded. 



Colors as in couchi, but dorsal region scarcely obscured by ashy. 

 Lores black. Wing, 7.50; tail, 7.50; bill, 1.30 and .40; tarsus, 

 l.GO ; middle toe, .90. Wing-formula, 5, 4, 6, 3= 7, 8, 9, 2 ; first, 

 2.75, shorter than longest. Graduation of tail, 1.15. Ilab. Mexico 

 (Orizaba, Mirador, etc.) Yar. sordid a " 



Graduation of the colors as in sordida, but the blue, instead of 

 being a bright ultramarine, is very much paler and duller, and with 

 a greenish cast, the whole dorsal region decidedly ashy ; ash of the 

 pectoral region much paler, and throat similar, instead of decidedly 

 whitish, in contrast ; pure white of posterior lower parts covering 

 whole abdomen instead of being confined to crissum. Wing, 6.20 ; 

 tail, 5.70 ; bill, 1.30 and .40 ; tarsus, 1.50 ; middle toe, .97. Wing- 

 formula, fourth, fifth, and sixth equal; 7, 3, 8, 9, 2 ; first, 2.20, 

 shorter than longest. Graduation of tail, .50. Hab. Southern 

 Rocky Mountains (Fort Buchanan, and Copper Mines, Arizona). 



var. arizoncE. 

 C. unicolor.' Lower parts bright blue, like the upper. Entirely 



ferred to this race, but which differs in such an important respect from all other specimens of 

 the several races referrible to califomica, as extended, that it may belong to a distinct fonii. 

 Having the precise aspect of sumichrasti in regard to its upper plumage, it lacks, however, any 

 trace of the blue edgings and pectoral collar, the whole lower parts being continuously uninter- 

 rupted dull white, purer posteriorly. The appearance is such as to cause a suspicion that it may 

 be a link between sumichrasti and one of the races of ultramarina. It measures : wing, 5.50 ; 

 tail, 6.00 ; graduation of tail, .70. 



1 Oyanocilta ultramarina, (Bon'ap.) Stuicklanb. — Garrulus ultramarinus, Boxap. J. A. 

 N. -S. IV, 1825, 386 (not of Audubon). 



'^ CyanocUta sordida, (Swains.) (not of Baird, Birds X. .Km., which is arizonm). — ScL.\TER, 

 Cat. Am. B. 1862, 143. Garruhts sordidus, .Swains. Phi!. Mag. 1827, i, 437. 



* Cyanocitta unicolor, (Du Bus) Bonap. Consp. p. 378. — Oyanocorax unicolor, Du Bus, 

 Bull. Acad. Bnix. XIV, pt. 2, p. 103. 



