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MEMOIRS OF THE CARNEGIE MUSEUM 
EXPLANATION OF PLATES. 
Puate A. 
Cambarus obscurus Hagen. Male of the first form, natural size.. Collected by the 
writer, Sept. 7, 1905, in the Alleghany River, Sandy Creek, Allegheny County. 
Cambarus obscurus Hagen. Female, natural size. From same locality. 
Cambarus diogenes Girard. Male of the first form, natural size. Collected by the 
writer, Aug. 26, 1905, at Baden, Beaver County. 
Cambarus carolinus Erichson. Female, natural size. Collected by the writer, Sept. 5, 
1905, at Rainier Park, Ohiopyle, Fayette County. 
PLATE B. 
Cambarus bartoni (Fabricius). Male of first form, natural size. Collected by the 
writer, Aug. 7, 1905, in Fern Hollow, Pittsburgh. 
Cambarus bartont robustus (Girard). Female, natural size. Collected by Miss G. 
Kinzer, Aug. 27, 1905, at Sixteen Mile Creek, Northeast, Erie County. 
Cambarus limosus (Rafinesque). Female, natural size. Collected by the writer, Sept. 
10, 1905, in the Schuylkill Canal, Manayunk, Philadelphia County. 
Cambarus monongalensis Ortmann. Female, natural size. Collected by the writer, 
Aug. 18, 1905, at Edgewood Park, Allegheny County. 
PLaTE XXXIX. 
Cambarus barton (Fabricius). Rostrum. All figures 4. 
Female, 70 mm. long. Collected by the writer, June 3, 1904, in North Versailles 
Township, Allegheny County, opposite Stewart. Catalogue number 74.327. Shape 
very broad, margins parallel. Not rare in western Pennsylvania. 
Female, 52 mm. long. Collected by the writer, Aug. 22, 1905, at Squaw Run, Alle- 
gheny County. Catalogue number 74.626. Shape typical; very frequent. 
Male, first form, 63 mm. long. Collected by the writer, Sept. 16, 1904, at Valley 
Forge, Chester County. Catalogue number 74.413. Shape typical, and character- 
istic of eastern specimens, but also found in the west. 
Young male, second form, 34 mm. long. Collected by the writer, Aug. 22, 1905, 
in Squaw Run, Allegheny County. Catalogue number 74.626. Usual shape in 
young specimens. 
Young female, 21 mm. long. Collected by the writer, June 25, 1904, in Jacob’s 
Creek, Laurelville, Fayette County. Catalogue number 74.356. Slightly longer 
than usual, but not rare in young specimens. 
Male, first form, 78 mm. long. Collected by the writer, May 27, 1904, in Squaw Run, 
Allegheny County. Catalogue number 74.320. Unusually short and strongly taper- 
ing, with exceptionally thick margin. 
