EXPLANATION OF THE PLATES. 



PLATE I. 



Fig. 1. Cambarus Alleiii Fax. Male, form I. Hawkinsville, Fla X 2 



" 2. Cambarus simulaus Fax. Male, form I. Dallas, Tex X 1 



" 3. Cambarus piibesceus Fax. Male, form II. McBeau Creek, Ga X 2 



" 4. Cambarus Hayi Fax. Male, form I. Eastern Mississippi X 1 



" 5. Cambarus immuuis, var. spiuirostris Fax. Male, form II. Obion Co., Tenn. . . X 2 



PLATE II. 



Fig. 1. Cambarus Cubensis Erioh.s. Male, form I. Havana, Cuba. . . . . . . X 2 



" 2. Cambarus Lecontci Hag.* Male, form I. Type. Mobile, Ala X 1 



" 3. Cambarus latimanus Hag. Female. Athens, Ga. . . . . . , . . X 1^ 



" 4. Cambarus fallax Hag. Male, form I. Type. Florida X 2 



" 5. Cambarus spiculifer Hag. Male, form I. Athens, Ga. . . . . . . . X IJ 



" 6. Cambarus Montezumae, var. tridens Von MAiiT.f Female. Mexico X 3 



PLATE III. 



Fig. 1. Cambarus Harrisonii Fax. Male, form I. Irondalc, Mo X 2 



" 2. Cambarus Mississippieusis Fax. Male, form I. Eastern Mississippi X IJ 



" 3. Cambarus Jordani Fax. Male, form II. Rome, Ga X 2 



" 4. Cambarus medius Fax. Male, form I. Irondale, Mo. . . . . . . X 2 



" 5. Cambarus acuminatus Fax. Female. Saluda Iliver, S. C X 2 



" 6. Cambarus Paljneri Fax. Male, form II. Obion Co., Tenn. X 2 



PLATE IV. 



Fig. 1. Cambarus Girardianus Fax. Male, form II. Lauderdale Co., Ala X IJ 



" 2. Cambarus argiUicola Fax. Alale, form I. Detroit, !Mich X 2 



" 3. Cambarus dubius Fax. Male, form I. Preston Co., W. Va X IJ 



" 4. Cambarus Alabamensis Fax. Male, form I. Lauderdale Co., Ala X 2 



" 5. Cambarus Slnanii Buxdy. Male, form I. New Albany, lud X 1 



" 6. Camliarus liamulatus Fax. Male, form II. Kickajack Cave, Tenn X 2 



* The rostrum is badly drawn. Compare the de.scription on page 29. 

 t The acumen of the rostrum is broken off in the specimen here figured. 



