94 
BULLETIN OF THE BUREAU OF FISHERIES 
pond in Cass County, the overflow of which drained into the Missouri River, and 
several ponds in Richardson County that drained into the Missouri River all con- 
tributed collections of Cambarus immunis. 
Niobrara River . — Several collections of Cambarus diogenes were made from 
Minichaduza Creek, a tributary. 
Platte River. — Sarpy County, at the State fisheries, provided a collection of 
C. immunis. At Louisville, a collection of C. immunis, C. immunis spinirostris , 
and C. virilis was taken from small tributaries, and from Salt Creek and Stevens 
Creek collections of C. immunis spinirostris. From ponds within the drainage of 
these creeks collections of both C. immunis and C. immunis spinirostris were taken. 
In several small creeks in Hall County, tributary to the Platte River, collections of 
C. virilis, C. immunis, and C. diogenes were taken. 
Fig. 1. — Map of rivers of Nebraska and eastern Colorado, showing distribution of crayfishes by river systems 
Key to species: 
1— C. (Faxonius) immunis 5 — C. (Faxonius) propinguus 
2 — C. (Faxonius) immunis spinirostris 6 — C. (Faxonius) neglectus 
3 — C. (Faxonius) virilis 7 — C. (Bartonius) argillicola 
4 — C. (Bartonius) diogenes 8 — C. (Cambarus) simulans 
North Platte River. — From the Elkhorn River, in Holt County, a collection of 
C. immunis was taken, and from the Laramie River, Laramie, Wyo., collections of 
C. virilis and C. immunis were reported by Harris (1903, pp. 134 and 192). 
South Platte River. — Julesburg, Colo., C. neglectus and C. virilis. From a 
tributary to the South Platte, in Wyoming, Harris (1903, p. 85) reported C. 
diogenes. 
Republican River — Harris (1903, p. 148) reports C. neglectus from near Guy, 
Cheyenne County, Kans., and C. virilis from Fort Riley, Kans. 
Big Blue River. — Five species were taken from the ponds, creeks, and rivers 
in Seward County — viz, C. immunis from adjacent ponds, C. immunis spinirostris 
and C. diogenes from several creeks, C. propinguus from Coon Creek, and C. virilis 
from the Big Blue River. Faxon (1898) reports C. immunis and C. virilis from 
“Blue River, Crete, Nebr.” 
