378 CRAYFISHES. 



Austin, Huron Co.; Sand Beach, Huron Co.; Pinnebog River, Port Crescent, 

 Huron Co.; Mud Creek, Bay Port, Huron Co.; Black River, near Port Huron, 

 Saint Clair Co. ; Pine River, West Harrisville, Alcona Co. ; Au Sable River, Au 

 Sable, Iosco Co.; Rabbit's Back Creek, 5 miles above Saint Ignace, Mackinac Co. ; 

 12 miles from Straits of Mackinac. Minnesota: Deer River, Itasca Co.; Lake 

 of the Woods. North Dakota: Borit's Ford, Cheyenne River. Nebraska: 

 Lincoln Creek, York, York Co. Missouri: CUnton, Henry Co. (U. S. N. M.). 

 Colorado: Republican River, Wray, Yuma Co. (M. C. Z.). Mexico: Jimenez, 

 State of Cliihuahua (Field Mus. Nat. Hist.). 



The Mexican specimens (four females) were collected by Mr. S. E. Meek 

 from deep holes, Rio de los Conchos, about two miles below Jimenez, June 9, 

 190L For the circumstances of their capture, see under Cambarus propinquus, 

 page 373, 374. 



Cambarus immunis Hagen. 

 Plate 2, 6. 



Neiv localities: — Nebraska: Norfolk, Madison Co. (U. S. N. M.); Elkhorn 

 River, Fremont, Dodge Co. (U. S. N. M.); Omaha, Douglas Co. (M. C. Z.). 

 Missouri: Lake City, Jackson Co. (M. C. Z.). Iowa: West Fork of Des 

 Moines River, Spring Vale, Humboldt Co. (M. C. Z.). Michigan: Pine River 

 near West Harrisville, Alcona Co. (U. S. N. M.); Caseville, Huron Co. (U. S. 

 N. M.) ; mouth of Bunce River, south of Port Huron, St. Clair Co. (U. S. N. M.). 

 Illinois: Wabash Co. (U. S. N. M.); Indian Creek, Abingdon, Knox Co. (U. S. 

 N. M.); Illinois River, Havana, Mason Co. (U. S. N. M.). Ohio: Cedar Point, 

 and Presque Isle, Toledo, Lucas Co. (U. S. N. M.) ; Toussaint River, ten miles be- 

 low Port CUnton, Ottawa Co. (U. S. N. M.). New York: Pond near the 

 mouth of Cattaraugus Creek, Chautauqua Co. (U. S. N. M.) ; Silver Creek, Chau- 

 tauqua Co. (U. S. N. M.) ; Fish Creek, Buffalo, Erie Co. (U. S. N. M.) ; Stony Is- 

 land, Jefferson Co. (U. S. N. M.). Massachusetts: Pontoosuc Lake, Lanes- 

 borough, Berkshire Co. (M. C. Z.) ; Onota Lake, Goodrich Pond and Housatonic 

 River, Pittsfield, Berkshire Co. (M. C. Z.) ; East Washacum Pond, Sterling, Wor- 

 cester Co. (M. C. Z.); Blackstone River, Uxbridge, Worcester Co. (M. C. Z.); 

 Lake Boone, Stow, Middlesex Co. (Boston Soc. Nat. Hist.) ; Walden Pond, Con- 

 cord, Middlesex Co. (M. C. Z.). New Hampshire: Lake Winnepesaukee 

 (U. S. N. M.). 



Cambarus immunis, taken as a whole, has an enormous range, as a common 

 species, through the western states, from northern Ohio, through Indiana, 



