HARRIS : CRAYFISHES GENUS CAMBARUS. 85 



29. New Jersey. 



1. [Delaware R.], Mercer county. (F., '85.) 



32. North Carolina. 



1. [Cape Fear R.], Wilmington [New Hanover county]. (F., '85.) 



2. [Neuse R.], Kinston [Lenoir county]. (F., '85.) 



?3. [Atlantic O,], Beaufort [Carteret county]. (F., '85.) 



84. Ohio. 



1. [Scioto R.], Columbus and Lockbourne, Franklin county. (F., '98.) 



2. [Trib. Miami R.], around Oxford [Butler county]. (Hargitt, '90.) 



37. Penusjlvauia. 



1. [Trib. Alleghany R.], Derry station, Westmoreland county. (F., '85.) 



2. Ohio or Alleghany river, Fern Hollow, Pittsburgh, Allegheny county. (Will- 



iamson, '01.) 



41. Tennessee. 



?1. Mud chimneys resembling those of C. diogenes are found. (F., '85.) 



45. A'irginia. 



1. [Potomac R.], Alexandria county. (F., '85.) 



2. [Atlantic O.], Accomack county. (F., '85.) 



.3. [Atlantic O.], Northampton county. (F., '85.) 



4. [Rappahannock R.], Fredericksburg [Spottsylvania county]. (F., '85.) . 



5. [Trib. James R.], Petersburg [Dinwiddle county]. (F., '85.) 



6. [Potomac R.], Prince William county. (F., '90.) 



48. Wisconsin. 



1. Tributaries of Pecatonica river, Green county. (F., '85.) 



2. [Fox R.], Appleton [Outagamie county]. iF., '85.) 



3. [Lake Michigan], Racine [Racine county]. (F., 85.) 



49. Wyoming-. 



1. [Trib. South Platte R.], Cheyenne [Laramie county]. (F., 85.) 



Cambarus diogenes ludoviciana Fax. 

 17. Louisiana. 



1. [Mississippi R.], New Orleans [Orleans county]. (F., '85.) 



Audubon ('39) figures the chimney of a crayfish, probably 

 C. diogenes. In describing the food habits of the white ibis, 

 he says: "The crayfish often burrows to a depth of three or 

 four feet in dry weather, for, before it can be comfortable, it must 

 reach the water. This is generally the case during the pro- 

 longed heats of summer, at which time the white ibis is much 

 pushed for food. The bird, to procure the crayfish, walks with 

 remarkable care towards the mounds of mud which the latter 

 throws up while forming its hole, and breaks up the upper part 



