156 
ON THE GEOLOGY AND NATURAL HISTORY 
often met with it along the wooded bottoms of the Missouri, especially in the State of 
Missouri, and in Kansas and Iowa. It is very rarely seen as high up the Missouri river 
as Fort Randall, near latitude 43°, longitude 99°, but it is never seen on the Upper Mis¬ 
souri. 
Centurus Carolinus, Bonap. 
Red-bellied Woodpecker. Baird, General Report on Birds, p. 109. 
Quite rare in the Northwest. Ranges from the Atlantic coast to the eastern slope of 
the Rocky mountains. 
Melanerpes erythrocephalus, Sw. 
Red-headed Woodpecker. Baird, General Report on Birds, p. 113. 
This is one of the most abundant birds in the Northwest. Scarcely a dry tree is seen 
along the wooded bottoms of the Missouri or its tributaries, that is not the abode of one 
or more pairs of this beautiful species. 
Melanerpes torquatus, Bonap. 
Lewis’s Woodpecker. Baird, General Report on Birds, p. 115. 
This bird seems to be confined to the immediate vicinity of the mountains. I first ob¬ 
served it associated with the preceding in March, 1855, near the Black hills, and at 
Laramie peak we met with it in great numbers. It seems to be common to both sides of 
the Rocky mountain range. 
Colaptes Auratus, Swainson. 
Yellow-shafted Flicker. Baird, General Report on Birds, p. 118. 
Abundant along the wooded bottoms of the Missouri and its tributaries. 
Colaptes Mexicanus, Swains. 
Red-siiafted Flicker. Baird, General Report on Birds, p. 120. 
Unlike the last, this species is seldom seen along the valleys of streams, but is most abun¬ 
dant in the wooded ravines of the Bad Lands, high up towards the sources of the Missouri. 
Range: From the Black hills to the Pacific. 
Colaptes hybridus, Baird. 
Hybrid Woodpecker. Baird, General Report on Birds, p. 122. 
Under the above name, Professor Baird includes a remarkable species of woodpecker, 
from the Upper Missouri and Yellowstone, which seems to be a hybrid between the two 
preceding. Twenty-one specimens were obtained in our explorations. 
Chaetura pelasgia, Steph. 
Chimney Swallow. Baird, General Report on Birds, p. 144. 
Quite rare on the Upper Missouri. But one specimen was secured, and that was taken 
