

OF THE UPPER MISSOURI. 297 
route, and obtained only the eggs of some unknown warbler ; 
of a Pipilo; of the Robin (Turdus migratorius), which had 
its nest built in a split trunk of a fallen tree; eight eggs of 
the Rock Wren (Salpinctes obsoletus), found in a log-house 
which was torn down for fuel; two nests and nine eggs of 
the Shore Lark ( Eremophila cornuta); and one of a Night- 
hawk, probably Ohordeiles Henryi, which I found on the bare 
gravelly bluff. I noticed here the firs& Magpies (.Pica Hud- 
sonica) and a strange Woodpecker. 
Arriving at Fort Benton July 2nd, we remained in camp 
there until August 7th, and this being the worst season for 
collecting specimens I obtained but few. The country near 
the fort is also too flat and bare to be productive of a great 
variety of animals, being exactly in the middle of the wide 
valley lying between the Black Hills and Rocky Mountains, 
while there are few trees or bushes along the river. The 
tiver, however, furnishes quite a variety of fish, including 
Pike (Esox sp.), Catfish (Pimelodus olivaceus and Noturus 
flavus), Pike Perch ( Stizostedion boreus), Grunter (Amblo- 
grunniens), Carp ( Carpiodes damalis) , and several other 
Cyprinoids which furnish much sport, and some of them good 
eating. Dr. Hayden's "Report of Explorations in N ebraska," 
for 1859, gives full lists of these and other animals found by 
him during several years collecting in this region. 
At and above the Great Falls, thirty miles higher up the 
river, we also found trout abundant (Salmo Lewisit), and 
. also a Coregonus, and other species of fishes apparently new. 
It is somewhat singular that the fresh-water Mollusca which 
I found here were all different species from any obtained by 
E Dr. Hayden in the lower parts of the Missouri and its 
branches, except Unio luteolus and Physa heterostropha, 
the rest being Limnea palustris, bulimoides and desidiosa, 
Spherium striatinum, Margaritana (margaritifera var?) 
: Jalcata, while Dr. Hayden obtained thirty other species 1D 
Nebraska. The above, also, are nearly all found west of 
the Rocky Mountains, or represented there by closely allied 
_ AMER. NATURALIST, VOL. III. 38 

