104 THE NAUTILUS. 
Except the Anodonta these species have not yet been recorded 
anywhere else in Colorado, though we have in the University of 
Colorado Museum unreported specimens of the Anodontoides 
from Julesburg, Denver and Boulder. Possibly Lampsilis no 
longer lives in the State. In 1912, in company with Dr. Max 
M. Ellis, I visited Lodgepole Creek and searched the stream 
from the northern state boundary to its junction with South 
Platte River. We found no Unionidae except some dead shells 
of Anodontoides. Perhaps that species was still living in a deep 
pool a few rods south of the state boundary, though in seining 
it for fishes we found none. A rancher near by told us there 
were ‘‘clams’’ in the pool. The rest of the stream was shallow 
and so narrow one could step or jump over it in most places. 
Probably later in the summer of dry, hot seasons, when the 
natural flow was diminished and the demand for irrigation 
water is great, it may entirely dry up in its lower course. I 
wrote to Mr. Simpson, calling his attention to present condi- 
tions and the evident disappearance of the Lampsilis, and ask- 
ing what the conditions were when he was there. He replied 
that as he recalled it the creek was then from 6 to 10 feet wide, 
but that the taking of water from the South Platte for irrigation 
had caused the river to go dry at Julesburg during his three 
years residence, and suggesting that the same thing had likely 
since happened in the creek. This seems exceedingly probable. 
Mr. Simpson also added: ‘*The Unio anodontoides is probably 
Lampsilis fallaciosus, not then recognized.’’ My intention in 
1912 was to publish an account of our experience, but it was 
side-tracked and finally passed out of mind. It has recently 
been brought forward by finding in the report of the Fremont 
Expedition, 1845, p. 25, the statement that on July 6, 1842, 
Lodgepole Creek was a ‘‘clear, handsome stream’’ (hence at 
low water stage), with a ‘‘ uniform breadth of twenty-two feet 
and six inches in depth.’’ This confirms the supposed dimin- 
ution of water in the stream in recent times. 
In 1906 the bed of the lower portion of Crow Creek, east and 
northeast of Greeley, Colorado, was dry, except just after storms, 
the water percolating through the deep sand in the channel, a 
characteristic of many western streams. Up stream, just above 
