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MEMOIRS {OF THE CARNEGIE MUSEUM 
Cambarus bartoni (Fabricius). Inner view of left first pleopod of male, first form. 3. 
Collected by the writer, Oct. 6, 1905, at Weskit, near Kittanning, Armstrong 
County. Catalogue number 74.665. 
Cambarus carolinus Erichson. Inner view of left first pleopod of male, first form. 4. 
Collected by the writer, Sept. 7, 1904, at Dunbar, Fayette County. Catalogue 
number 74.410. 
Cambarus monongalensis Ortmann. Inner view of left first pleopod of male, first form 
(cotype), #. Collected by the writer, Oct. 10, 1903, at Edgewood Park, Allegheny 
County. Catalogue number 74.182. 
Cambarus diogenes Girard. Inner view of left first pleopod of male, first form. 3. 
Collected by the writer, September 5, 1904, at Smithfield, Fayette County. Cata- 
logue number 74.406. 
Pate XL. 
Cambarus obscurus Hagen. Upper view of right chela of a male, first form, 77 mm. 
long, natural size. Collected by the writer, Sept. 30, 1905, in the Alleghany River, 
Twelve-Mile Island, Allegheny County. Catalogue number 74.663. 
Cambarus bartoni (Fabricius). Upper view of right chela of a male, first form, 82 mm. 
long, natural size. Collected by the writer, Nov. 22, 1905, in Fern Hollow, Pitts- 
burgh, Allegheny County. Catalogue number 74.681. 
Cambarus bartoni robustus (Girard). Upper view of right chela of a male, first form 
98 mm. long, natural size. Collected by the writer, July 11, 1905, at Spartansburg 
Crawford County. Catalogue number 74.596. 
Cambarus carolinus Erichson. Upper view of right chela of a female, 77 mm. long, 
natural size. Collected by the writer, Oct. 16, 1905, at Dunbar, Fayette County. 
Catalogue number 74.669. 
Cambarus monongalensis Ortmann. Upper view of right chela of female, 71 mm. long, 
natural size. Collected by the writer at Edgewood Park, Allegheny County, April 
4, 1905. Catalogue number 74.495. 
Cambarus diogenes Girard. (Eastern form.) Upper view of right chela of a male, first 
form, 83 mm. long, natural size. Collected by the writer, Sept. 21, 1905, at Ridley 
Park, Delaware County. Catalogue number 74.654. 
Cambarus diogenes Girard. (Western form.) Upper view of right chela of a male, 
second form, 93 mm. long, natural size. Collected by the writer, April 15, 1905, 
at Millvalle, Allegheny County. Catalogue number 74.507. 
Burrow of Cambarus bartoni (Fabricius). In spring on hillside, west of Spruce Run, 
Avalon, Allegheny County, opened by the writer, July 2, 1904. 
Side view (section); 86. Upper view. ‘mp, pile of mud consisting of clay, sand, and 
small stones; d, ditch; x, place where crawfish, female, 52 mm. long, was found. 
At & springwater was running into the hole ina strong flow, and running out through 
the hole, over and past the pile of mud into a ditch. 
