HARRIS : CRAYFISHES GENUS CAMBARUS. 119 



out of the mouth of the burrow, thus forming a 'dump' such 

 as is frequently seen at the mouth of hillside coal-mines. 



"The crayfish which build the regular 'chimneys' usually 

 burrow at night, but these specimens were actively at work at 

 noon, when they were taken." 



It is interesting to note that the method which Mr. Sutton 

 observed C. -pilosus use in removing a stone from its burrow is 

 essentially the same as that described nearly sixty years before 

 for C. hartonii ( ?) by Godman ( '42 ) . 



Harris ( '02 ) adds tliat Mr. Sutton's material was taken in 

 Kelp Fork, a "wet weather" stream of fresh water which 

 flows into Salt creek, a tributary of the Saline river. At the 

 time the material was taken water was not flowing from the pools 

 into the creek. During the summer of 1901, Mr. Sutton took 

 material from a well about five feet in depth, near the above 

 region. The water from the pools, when high, would overflow 

 into the wells. 



Cambarus propinquns GriR. 



Lake Superior. (F., '85.) 



Canada. 



1. [St. Lawrence R.], Montreal [Quebec]. (F., '85). 



2. [Lake Ontario], Toronto [Ontario]. (F., '85.) 



11. Illinois. 



1. [Rock R.], Freeport, Stephenson county. (F., '85.) 



2. [Rock R.], Ogle county. (F., '85.) 



3. [Illinois R.], Geneva, Kane county. (F., '85.) 



4. [ Branch of Illinois R ], Pekin, Tazewell county. (F. , '85.) 



5. [Trib. Illinois R.], Normal, McLean county. (F., '85.) 



6. [Trib. Illinois R.], Decatur, Macon county. (F., '85.) 



7. Aux Plains river. (F., 85.) 



12. Indiana. 



1. Elkhart river, Rome City, Noble county. (F., '85.) 



2. [Trib. Wabash R.], Delphi, Carroll county. (Hay, '96.) 



3. [White R.], Indianapolis, Irvington, and Millersville, Marion county. (Hay, '96.) 



4. [Lake Michigan], Michigan City, Laporte county. (Hay, '96.) 



5. Lake Maxinkukee and Twin Lakes, Marshall county. (Hay, '96.) 



6. Turkey lake, Kosciusko county, (Hay, '96.) 



7. Indian lake, Waterloo, De Kalb county. (Hay, '96, and F., '98.) 



8. Turman creek, Sullivan county. (Hay, '96.) 



9. [Wabash R.], Lafayette, Tippecanoe county. (Hay, '96.) 



10. Clear creek, Bloomington, Monroe county. (F., '85, and Hay, '96.) 



11. [Trib. White R.], Switz City, Greene county. (Hay, '96.) 



12. [White Water R.], Brookville, Franklin county. (Hay, '96.) 



13. Salt creek, Brown county. (Hay, '96.) 



14. White river. (F. '85.) 



