EXPLANATION OF THE PLATES. 



PLATE I. ^ 



Fig. 1. Carabarus Alleni Fax. Male, form I. Ilawkiusville, Fla X 2 



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



" 3. Cambarus pubescens Fax. Male, form II. McBcau Creek, Ga X 2 



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



" 5. Cambarus immunis, 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 latimanus Hag. Female. Atheus, Ga X H 



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



" 5. Cambarus spieulifer Hag. Male, form I. Atbens, Ga X H 



" C. Cambarus Montezuma;, var. tridens Von Mart.j Female. Mexico X 3 



PLATE III. 



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



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



" 3. Cambarus Jordaui 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 River, S. C X 2 



" 6. Cambarus Palmeri Fax. Male, form II. Obion Co., Teun X 2 



PLATE IV. 



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



" 2. Cambarus argillicola Fax. Male, form I. Detroit, Mich X2 



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



" 4. Cambarus Alabamensis Fax. Male, form I. Lauderdale Co., Ala X2 



" 5. Cambarus Sloanii Bundt. Male, form I. New Albany, Ind Xl 



" 6. Cambarus bamulatus Fax. Male, form II. Niekajaek Cave, Tenn X2 



* The rostrum is badly drawn. Compare tbe description on y-ige 29. 

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



