366 



AMERICAN ORNITHOLOGY. 



Identification Chart No. 11. 



597. Blue Grosbeak (Guiraca caerulea). 

 Eastern United States from New Jersey, Illinois and 



Nebra^ka southwards. Male: Length 6.5 in. Near- 

 ly a uniform rich dark blue. Tail, wings, and feathers 

 at the base of the bill, black, the former being edged 

 with blue. Shoulder bright chestnut and edges of sec- 

 ondaries and coverts pale chestnut. Bill, light horn 

 color. Female: Brown above and paler below, with 

 faint streaks on the under parts. Wings and tail gray, 

 the former with whitish cross bars and the latter edged 

 with bluish. 597a. Western Blue Grosbeak, (G. c. 

 eiirhv>ica) Southwestern U. S. from S. Dakota, Col- 

 orado and California to Mexico. Male and female like 

 the eastern form. 



598. Indigo Bunting, (_Passerina cyanea). 

 North America east of the Plains and south of south- 

 ern Canada. Male: Length S-S inches. Intense blue 

 on the head shading into a rather greenish blue on the 

 rest of body. Wings and tail blackish glossed with 

 greenish blue. Female: Above brown and below 

 brownish white. Wings and tail slightly edged with 

 greenish, but the former are not distinctly barred. 



766. Bluebird, {Sialia sialis). 



America east of the Rocky Mts. and south of Mani- 

 toba and Nova Scotia. South in winter to the Gulf 

 States and Cuba. Male: Length, 6.5 inches. Entire 

 upper parts a rich azure blue. Chin, throat, and 

 breast, chestnut. Rest of under parts, white. Female: 

 Blue of the upper parts mixed with dull, reddish brown, 

 except on the wi-gs, rump and tail, where it is bright. 

 Under parts paler than in the male. 766a, Azure Blue- 

 bird, (S. s. apirea) Southern Arizona and eastern Mex- 

 ico. Very similar to the eastern Bluebird. 



767. Western Bluebird, (^Sialia mexicana oc- 

 cidentalis) . 



West of the Rockies from British Columbia south. 

 Male: Length, 6.5 inches. Whole head and neck, 

 rumr', wings and tail, r.ch blue, Middle of back, 

 breast and sides, bright chestnut. Belly and under 

 tail coverts pale, bluish white. Female: Duller than 

 the male; about the same as the eastern Bluebird. 

 767a. Chestnut-backed Bluebird, (5. >n. bairdi) Rocky 

 Mts. from northern U. S. to Mexico. Chestnut on 

 the back, rather brighter than the Western. 767b. 

 San Pedro Bluebird, (S. m. auabelae) Lower California. 

 Like the Chestnut-backed. 



768. Mountain Bluebird, (Sialia arctica). 



America west of the Plains and from Great Slave Lake 

 to Mexico. Length, 6.5 in. Above, light azure blue. Be- 

 low, pale and more greenish and shading gradually into 

 white on the abdomen. Female: Nearly uniform 

 gray, lighter on the belly and brightening into blue on 

 the rump, wings and tail. 



