MATERIAL EXAMINED 



The collections examined are listed 

 from north to south along the Atlantic Coast; 

 California specimens are listed at the end. The 

 abbreviations used are C.U., Cornell Universi- 

 ty; U.S.N.M., United States National Museum; 

 U. Md., University of Maryland; N.C.S.C, 

 North Carolina State College; U.M., University 

 of Michigan. The 1954 collections from the 

 Hudson River were made by Warren F . Rathjen 

 and Lewis C. Miller (RM) of the New York 

 State Conservation Department. The mileage 

 from the mouth of a river is sometimes given. 

 Thus PX40 denotes a distance of 40 miles from 

 the mouth of the Patuxent PUver . Mileage in 

 the Pamunkey and Mattaponi Rivers is from the 

 mouth of the York River. In the case of the 

 Chickahominy River, its mileage is measured 

 from the mouth of the James River . Standard 

 geographical abbreviations are used. For each 

 collection the following data are given: Loca- 

 tion, date of collection, number of specimens 

 counted, in parenthesis, and catalog number. 



Quebec: St. Lawrence R. at Chateau- 

 Richer Village about 20 mi . west of Quebec 

 City, Oct. 22, 1944, (62), C.U. 29605. 



New Brunswick, Miramichi R.: Vicinity 

 of Chatham, Dec. 7-21, 1952, (50), C.U. 22135; 

 Dec. 1953, (28), C.U. 28376; Loggieville to 

 Newcastle, Nov. 15-Dec. 15, 1955, (55), C.U. 

 29727. 



Nova Scotia, Philip R . : 5 miles above 

 Moater, Nov. 1955, (7), not catalogued; Ph5, 

 Dec. 1955, (60), not catalogued. 



Rhode Island: Pt. Saconnet, May 11, 

 1953. (37), C.U. 20641; Newport, May 24, 1955, 

 (21), C.U. 29091. 



Connecticut, Cos Cob Power Plant: Jan . 

 1953, (6), C.U. 21709; Jan. -Feb. 1953,, (22), 

 C.U. 20640; Oct. 1953, (21), C.U. 28377; Dar- 

 ien, L.I. Sd., Oct. 30, 1954, (1), C.U. 28341; 

 Greenwich, L.I. Sd., Nov. 11, 1954, (1), C.U. 

 28342; Darien, L.I. Sd., Oct. 30, 1954, (1), 

 C.U. 28343; Greenwich, L.I. Sd., Oct. 19, 1954, 

 (5), C.U. 28344; Fairfield, L.I. Sd., Aug.- 

 Nov. 1954, (14), C.U. 28267. 



New York, Hudson River: 

 1936: Haverstraw, Aug. 25, (27), C.U. 

 5180; Nyack, Sept. 1, (10), C.U. 27063. 



1949: Port Ewen, Aug. 26, (12), C.U. 

 18215; Haverstraw and Stoney Pt., Aug. 5, (36), 

 C.U. 15463; Haverstraw and Stoney Pt., Sept. 13, 

 (13), C.U. 18219; Stoney Pt., Aug. 26, (21), 

 C.U. 18221. 



1950: Catskill to Piermont, Sept. 4-9, 

 (36), C.U. 21070. 



1952: Kingston, Oct. 9, (2), C.U. 22714; 

 Fishkill, Aug. 21, (3), C.U. 22715; Fishkill, 

 Oct. 9, (2), C.U. 22716; Haverstraw, Aug. 7, 

 (2), C.U. 22717; Haverstraw, Aug. 15, (7), C.U. 

 22718; Haverstraw. Oct. 9, (3), C.U. 22719. 



1953: Coxsackie, Sept. 10, (50), C.U. 

 24028; Beacon, Sept. 11, (12), C.U. 24037; 

 Haverstraw, Sept. 11, (55), C.U. 24043. 



1954: Coxsackie, Aug. 4, (50), C.U. 

 27128; Coxsackie, July 26, (23), RM 116; Cox- 

 sackie, Oct. 14, (9),. RM 190; Coxsackie, June 23. 

 (54), C.U. 26281; Coxsacki, July 13, (16), C.U. 

 26380; Middle Ground Is., July 8, (8), RM 89A; 

 Haverstraw, Sept. 30, (34), RM 184; Haverstraw, 

 Aug. 9, (9). RM 151; Haverstraw, Aug. 13,(6), 

 RM 143; Haverstraw, July 29, (40). RM 126; 

 Haverstraw. Sept. 21, (23), RM 175; Haverstraw, 

 Oct. 20, (30), RM 192; Haverstraw, July- Aug. 

 (12), RM 1-12; Harmon, Aug. 27, (20), RM 155; 

 Harmon, Sept. 21, (27), RM 174; Croton, Nov. 4, 

 (19), RM 194; Nyack, Aug. 19, (31), RM 152; 

 Nyack, Aug. 4, (50), C.U. 27037; Palisade State 

 Park, Sept. 10, (14), RM 168; Palisade State 

 Park, Sept. 30, (34), RM 185; Palisade State Park, 

 Oct. 20, (20). RM 193. 



New Jersey: Mullica R., at Lower Bank, 

 Feb. 16, 1954, (45), C.U. 25779; Delaware R. 

 at Deepwater: Oct. 9, 1952(83), C.U. 22004 and 

 Aug. 26, 1953, (39), C.U. 23755; Maurice R., 

 Yaup Shore Station, Sept. 8, 1954, (16), C.U. 28453. 



Chesapeake Bay and tributary rivers: 



Susquehanna R. at B. and O. R.R. Bridge: 

 Sept. 14, 1955, (14), C.U. 29724; Sept. 27, 1955. 

 (46), C.U. 29675. 



