346 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



Obviously the northern part of the Mississippi Valley is an area of 

 some importance in establishing whether or not these two species 

 overlap or intergrade. 



Distribution. — Northeastern United States, from New York west 

 to Wisconsin, south through the Appalachian system as far as South 

 Carolina and Tennessee. Material of the typical form of the species 

 has been seen from the following collections: 



Maryland: Frederick county: Catoctin Creek between Brunswick and Point 

 of Rocks on Md. Hy. 464, October 12, 1952, L. B. Holthuis (PCH 600). 



Minnesota: wright county: Clearwater River at Minn. Hy. 152, in the town 

 of Clearwater, July 20, 1958, Holt (PCH 790). 



North Carolina: watauga county: Campus pond at Boone, June 24, 1948, 

 Mike Wright (PCH 128). 



New York: franklin county: Chateauguay River just west of Chateauguay 

 on U.S. Hy. 11, May 21, 1951, D. W. Crocker and A. Gustafson (PCH 634). 

 lewis county: Mohawk River at West Leyden, August 22, 1952, Crocker (PCH 

 552); outlet of Brantingham Lake, 3.5 miles north of Lyons Falls, May 21, 1951, 

 Crocker and Gustafson, (PCH 639). tioga county: Catatonk Creek at Candor, 

 August 29, 1952, Crocker (PCH 569). tompkins county: Owasco Inlet, 3 miles 

 south of Groton, May 18, 1951, E. C. Raney (PCH 628). Wyoming county: 

 Cattaragus Creek at Arcada, August 29, 1952, Crocker (PCH 570). 



Pennsylvania: Philadelphia county: Wissahickon Creek in Philadelphia, 

 September 2, 1957, C. W. Hart (PCH 695). 



South Carolina: york county: 4.0 miles south of Rock Hill on S.C. Hy. 72, 

 April 20, 1958, Holt (PCH 748). 



Virginia: alleghany county: Dolly Ann Creek, 2 miles east of Covington on 

 U.S. Hy. 60, June 18, 1948, G. Ailstock (PCH 115). amherst county: Pedlar 

 River, 6.3 miles northwest of Forks of Buffalo on U.S. Hy. 60, November 11, 1947, 

 Horton H. Hobbs (PCH 82). augusta county: 7.6 miles north of Steeles Tavern 

 on U.S. Hy. 11, May 11, 1947, Hobbs (PCH 71). Bedford county: Little Otter 

 River, 3.1 miles east of Bedford on U.S. Hy. 460, Holt and Bobb (PCH 73). 

 BRUNSWICK county: 2.9 miles north of Edgerton on Va. Hy. 140, May 31, 1949, 

 Holt and Bobb (PCH 217). Buckingham county: 9.6 miles south of Sprouse's 

 Corners on U.S. Hy. 15, November 9, 1946, Hobbs and Hofifman (PCH 36). 

 CAMPBELL county: Evington, July 13, 1947, Hobbs (PCH 106). craig county: 

 1.5 miles south of Paint Bank on Va. Hy. 311, June 24, 1948, Hobbs (PCH 97). 

 chesterfield county: Small stream below the lake in Camp Shawandasee, near 

 Chesterfield Courthouse, May 14, 1949, Holt (PCH 211). fluvanna county: 

 1.5 miles south of Palmyra on U.S. Hy. 15, November 10, 1946, Hobbs and Hoff- 

 man (PCH 114). GRAYSON county: Stream in pasture north of High Rock, 

 northwest of Independence, July 17, 1949, Holt (PCH 260). hanover county: 

 3.1 miles north of Ashland on U.S. Hy. 1, June 3, 1949, Holt and Bobb (PCH 230). 

 HIGHLAND COUNTY: Sliaw's Creek, 6.6 miles east of McDowell on U.S. Hy. 250, 

 September 27, 1946, Hobbs (PCH 113). louisa county: 25.5 miles east of 

 Charlottesville on U.S. Hy. 250, July 2, 1948, Holt and Bobb (PCH 121). 

 MONTGOMERY COUNTY: Trillium Dale at Blacksburg, November 17, 1957, Holt, 

 Riggin, Hoffman (PCH 873) ; Bottom Creek, 0.5 mile northeast of Otey on Va. 

 Hy. 637, May 22, 1958, Holt and Hoffman (PCH 874). nelson county: North 

 Fork of Rockfish River, 5.4 miles south of Afton on Va. Hy. 151, September 1, 

 1946, Hobbs (PCH 112). Rockbridge county: Tributary to Buffalo Creek, 5.3 

 miles south of Lexington on U.S. Hy. 11, May 11, 1947, Hobbs (PCH 75); 4.3 



