EXPLANATION OF THE PLATES. 



PLATE I. 



Fig. 1. Cambarus Alleni FAX. Male, form I. Hawkinsville, Fla X 2 



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



" 3. Cambarus pubesceus 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 ERICHS. Male, form I. Havana, Cuba X 2 



" 2. Cambarus Lecontei HAG.* Male, form I. Type. Mobile, Ala X 1 



" 3. Cambarus latimauus 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 lj 



" 6. Cambarus Moutezumse, var. trideus VON MABT.f Female. Mexico X 3 



PLATE III. 



Fig. 1. Cambarus Harrisouii FAX. Male, form I. Irondale, Mo X 2 



" 2. Cambarus Mississippiensis FAX. Male, form I. Eastern Mississippi X 1 



" 3. Cambarus Jordaui FAX. Male, form II. Rome, Ga X 2 



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



" 5. Cambarus acumiuatns FAX. Female. Saluda River, S. C X 2 



" 6. Cambarus Palmeri FAX. Male, form II. Obion Co., Tenn X 2 



PLATE IV. 



Fig. 1. Cambarus Girardianus FAX. Male, form II. Lauderdale Co., Ala X 1J 



" 2. Cambarus argillicola FAX. Male, form I. Detroit, Micli X 2 



" 3. Cambarus dubius FAX. Male, form I. Preston Co., W. Va X H 



" 4. Cambarus Alabamensis FAX. Male, form I. Lauderdale Co., Ala. 



" 5. Cambarus Sloanii BUXDY. Male, form I. New Albany, Ind X 1 



" 6. Cambarus hamulatus FAX. Male, form II. Nickajack Cave, Tenn X 2 



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

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



