62 A REVISION OF THE AST ACID JS. 



The centre of distribution of this common Eastern species seems to Ije 

 the Appalachian Mountain system in Pennsylvania, and the Susquehanna 

 and Delaware Rivers with their tributary streams. To the northward from 

 this region it is found thi'oughout the State of New York, in the basins of 

 the Susquehanna, Delaware, Hudson, and St. Lawrence Rivers. I have seen 

 Massachusetts specimens from Williamstown, Berkshire Co. (Hudson River 

 basin), and from Grafton, Worcester Co. (Blackstone River basin). The 

 Grafton specimens were lately collected by Mr. L. W. Sargent, in a clear, 

 cold spring. I have been unable to obtain an^' specimens from Rhode 

 Island or Connecticut, but Prof. E. P. Larkin informs me that about forty 

 years ago crayfishes ((7. Bartoniil) were not uncommon at Westerly, R. I., on 

 the Pawcatuck River near the boi-der of Connecticut. Vermont specimens 

 have been received from Chittenden Co. on Lake Champlain. According to 

 Zadock Thompson, C. Bartonii is very common in many of the small streams 

 in the western part of the State. In the State of Maine, it occurs in the 

 valleys of the St. John, Kennebec, and Penobscot.* I have myself seen 

 specimens from Houlton and Maysville, Aroostook Co. (St. John valley), 

 and from Madison, Somerset Co. (Kennebec valley). Other localities in the 

 State from which crayfishes (probably C. Bartonii) have been reported are 

 the following : Heron Lake (Thoreaut) and Churchill Lake (A. S. Packard) on 

 Allegash River, a tributary of the St. John ; Moosehead Lake and Solon in 

 the Kennebec valley {fide Wm. Elder) j Lobster Pond (see Thoreau, Maine 

 Woods, p. 99) and Patten in the Penobscot valley. Professors ^'errill and 

 Smith, who have explored the neighborhood of Norway, Oxford Co., in the 

 Androscoggin valley, are confident that no Cambari are found in that part of 

 the State. The easternmost point from which C. Bartonii has been received 

 is St. John, New Brunswick. 



To the westward, C. Bartonii extends into the valley of the Ohio River 

 and its tributaries, in the States of Pennsylvania, West Virginia, Virginia, 

 Ohio, Indiana, Kentucky, and Tennessee. 



Southerly its range involves the area drained by the rivers that debouch 

 into Chesapeake Bay, in Maryland and Virginia. From North Carolina I 

 have seen specimens collected in the mountain region of the western part of 

 the State (McDowell Co.), and at Kinston in the eastern part of the State 



* The St, Joliii and Penobscot are couuccted by a canal from Tclos Lake to Webster Poud, and the 

 divide between the head-waters of the Penobscot and the Kennebec is so low that it is said that in very wet 

 seasons their waters mingle. (See Thoreau, Maine Woods, pp. 36, 2.50.) 



t Maine Woods, p. 23/. 



