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EXPLANATION OF THE PLATES. 
PLATE I. 
Cambarus Alleni Fax. Male, form I. Hawkinsville, Fla. 
Cambarus simulans Fax. Male, form I. Dallas, Tex. 7 F 
Cambarus pubescens Fax. Male, form II. McBean Creek, Ga. . 
Cambarus Hayi Fax. Male, form I. Eastern Mississippi. : . 
Cambarus immunis, var. spinirostris Fax. Male, form II. Obion Co., Tenn. 
PLATE II. 
Cambarus Cubensis Ertcus. Male, form I. Havana, Cuba. 
Cambarus Lecontei Hac.* Male, form I. Type. Mobile, Ala. . 
Cambarus latimanus Hac. Female. Athens, Ga. 
Cambarus fallax Hac. Male, form I. Type. Florida. 
Cambarus spiculifer Hac. Male, form I. Athens, Ga. : - 
Cambarus Montezume, var. tridens Von Mart. Female. Mexico. 
PLATE II. 
Cambarus Harrisonii Fax. Male, form I. Irondale, Mo. . : 
Cambarus Mississippiensis Fax. Male, form I. Eastern Mississippi. . 
Cambarus Jordani Fax. Male, form II. Rome, Ga. 
Cambarus medius Fax. Male, form I. Irondale, Mo. 
Cambarus acuminatus Fax. Female. Saluda River, 8. C. 
Cambarus Palmeri Fax. Male, form II. Obion Co., Tenn. 
PLATE IV. 
Cambarus Girardianus Fax. Male, form II. Lauderdale Co., Ala. . 
Cambarus argillicola Fax. Male, form I. Detroit, Mich. 
Cambarus dubius Fax. Male, form I. Preston Co., W. Va. 
Cambarus Alabamensis Fax. Male, form I. Lauderdale Co., Ala. 
Cambarus Sloanii Bunpy. Male, form I. New Albany, Ind. . 
Cambarus hamulatus Fax. Male, form Il. Nickajack Cave, Tenn. 
* The rostrum is badly drawn. Compare the description on page 29. 
+ The acumen of the rostrum is broken off in the specimen here figured. 
