Mr. Crevecœur collected C. immunis in a stagnant pond on the prairie near Onaga, Pottawatomie county, April 1, 1901.
The pond had been in existence about six years, and had never been known to go dry. The nearest creek was about a quarter of a mile away. They were probably never connected when the water was high in the creek. No fish had ever been taken in the pond, but specimens of Amblystoma tigrinum (green) were found. (A. tigrinum and C. immunis are sometimes found in the same ponds in Douglas county.)
Among a dozen specimens given to me, some of the females were carrying eggs but none were noticed with young.
Mr. Crevecœur drained the pond in obtaining the material, and was careful to secure a representative collection. If C. gracilis were common in the region, it would not be improbable that females would be found in the pond at this time.
Reports so far would indicate a distribution of this species from the Missouri river west along the Kansas and its tributaries nearly two-thirds the distance across the state.
5a. Cambarus immunis Hagen, var. spinorostris Faxon.
The limits of distribution are embraced within those given for C. immunis.
6. Cambarus nais Faxon.
So far as reported, this species is confined to the southeastern portion of the state, drained by the tributaries of the Arkansas river.