168 ON THE GEOLOGY AND NATURAL HISTORY 
EvsrizA AMERICANA, Bonap. 
Brack-rHRxoatep Buntine. Baird, General Report on Birds, p. 494. 
Very abundant along the Missouri river and its tributaries. We secured seventeen 
specimens of this bird. 
GUIRACA LUDOVICIANA, Sw. 
ROSE-BREASTED GROSBEAK. Baird, General Report on Birds, p. 497. 
Abundant along the wooded bottoms of the Missouri, also Eastern United States. 
GUIRACA MELANOCEPHALA, Sw. 
BLACK-HEADED GROSBEAK. Baird, General Report on Birds, p. 498. 
This beautiful and somewhat peculiar bird seems to be confined to the Western coun- 
tries. Its usual places of resort are the wooded bottoms of streams, but it builds its nest 
in the thickets among the hills. 
GUIRACA CAERULEA, Sw. 
Buue GrosBeak. Baird, General Report on Birds, p. 499. 
Like the preceding, this species is very attractive on account of its color, being a glossy 
blue. I have never seen it in but one locality, the Loup fork of the Platte, and therefore 
suspect that it is rare in the West. 
CYANOSPIZA AMOENA, Baird. 
Lazuut Fincu. Baird, General Report on Birds, p. 504. 
This beautiful little bird is quite abundant in the wooded portions of the Missouri river 
country. It is also peculiarly Western in its range. 
CARDINALIS VIRGINIANUS, Bonap. 
Rep Brrp. Baird, General Report on Birds, p. 509. 
Very common throughout the State of Missouri, where I have seen it in January. It 
does not occur above Fort Pierre on the Missouri, 
PIPILO ERYTHROPHTHALMUS, Vieill. 
Grotnp Rosin; Towner. Baird, General Report on Birds, p. 512. 
This species is quite abundant on the wooded bottoms of the Missouri, until we reach a 
pat about latitude 43°, when it seems to be replaced to a certain extent by the succeed- 
ing species. 
Pireito Arcticus, Sw. 
Arctic TowHer. Baird, General Report on Birds, p. 514. 
Near the mouth of Niobrara river this species begins to make its appearance in great 
numbers, and is found from thence throughout the Northwest. It is peculiarly a West- 
ern bird, 
