160 ON THE GEOLOGY AND NATURAL HISTORY 
bottoms of the Missouri. Its minute size and rapid flight from limb to limb among the 
tallest branches of the lofty cottonwoods renders it a somewhat difficult bird to secure. It 
is most abundant on the Lower Missouri below Fort Pierre. 
GEOTHLYPIS TRICHAS, Cab. 
MaryLanp YELLOw-THROAT. Baird, General Report on Birds, p. 241. 
A very abundant little bird, inhabiting the thick willow bottoms of the different streams 
along the Missouri, from the mouth to the source, in the mountains. Seven specimens 
were collected. 
IcTERIA LONGICAUDA, Lawr. 
LonG-TaILeD CHAT. Baird, General Report on Birds, p. 249. 
Very abundant among the low bushes of the bottom prairies along the Missouri. It 
conceals itself among the foliage, so that it is seldom seen, and seems to rival the mocking 
bird in the rapidity and variety of its notes. Its range is confined to the west of the 
Mississippi. ° | 
HELMINTHOPHAGA CELATA, Baird. 
ORANGE-CROWNED WARBLER. Baird, General Report on Birds, p. 257. 
Two specimens of the above species were collected by our party; one near .the mouth 
of the Big Sioux river, and the other on Bon Homme island. Whether it occurs high up 
on the Missouri we do not know, but it has been found in Oregon and other contiguous 
territories. We infer that it will be observed in other portions of Nebraska, 
SEIURUS AUROCAPILLUS, Sw. 
GOLDEN-cROWNED THRUSH. Baird, General Report on Birds, p. 260. 
A common, quiet bird, hopping about on the ground under the thick bushes or trees of 
the Missouri bottoms, below Fort Pierre. It was not observed above that point. 
SEIURUS NOVEBORACENSIS, Nutt. 
Water Turusu. Baird, General Report on Birds, p- 261. 
Less abundant than the last, and noticed very near the mouth of Vermilion river, where 
two specimens were secured. : | 
DENDROICA CORONATA, Gray. 
; YELLOW-RUMP WARBLER. Baird, General Report on Birds, p. 272. 
Very abundant along the wooded bottoms of the Missouri and its tributaries. Some- 
what rare above Fort Pierre, 
DENDROICA Aupusont, Baird. 
AUDUBON’s WaRBLER. Baird, General Report on Birds, p. 278. 
The only —— of this species observed was collected in the Laramie mountains near 
Fort Laramie, It is probably quite rare on the Missouri, 
