176 
ON THE GEOLOGY AND NATURAL HISTORY 
Querquedula discors, Steph. 
Blue-winged Teal. Baird, General Report on Birds, p. 779. 
Distribution same as last. 
Spatula clypeata, Boie. 
Shoveller. Baird, General Report on Birds, p. 781. 
One specimen only collected, near the mouth of Iowa creek. Very rare. 
Mareca Americana, Stephens. 
Baldpate. Baird, General Report on Birds, p. 783. 
Quite rare. One specimen taken in the Missouri river near Bijoux hills. 
Aix sponsa, Boie. 
Summer Duck. Baird, General Report on Birds, p. 785. 
Abundant throughout the West. 
Erismatura rubida, Bonap. 
Ruddy Duck. Baird, General Report on Birds, p. 811. 
Collected near mouth of the Platte and in the valley of White river. Not abundant. 
Mergus Americanus, Cass. 
Sheldrake. Baird, General Report on Birds, p. 813. 
More or less abundant throughout the Upper Missouri country. 
Lopiiodytes cucullatus, Reich. 
Hooded Merganser. Baird, General Report on Birds, p. 81C. 
One specimen was collected from the Yellowstone river. 
Larus Delawarensis, Ord. 
Ring-rilled Gull. Baird, General Report on Birds, p. 846. 
Very rare, but one specimen secured. 
Sterna frenata, Gambel. 
Least Tern. Baird, General Report on Birds, p. 864. 
Not abundant, though widely distributed along the Western streams. We collected it 
from the Platte and Yellowstone valleys. 
Hydrochelidon plumbea, Wils. 
Short-tailed Tern. Baird, General Report on Birds, p. 864. 
One specimen collected on the Loup fork. 
Podiceps Californicus, Heermann. 
California Grebe. Baird, General Report on Birds, p. 896. 
Quite rare. Two specimens collected in 1856, between Fort Union and Fort Berthold. 
