84 ASTACID^. 



terms obtusis ; lamina media parte utrinque bispina, parte apicali, sub- 

 longiori, elliptica. Pedibus anticis brevibus, latis; chela lata plana, 

 ciliato-punctata; subtus lsevi, ad marginem internum sulcata ; margin e 

 interno brevi, incurvo, tuberculoso-serrato ; digitis duplo longioribus, 

 latis, rectis, bicostatis, lineato-punctatis, ciliatis ; digito mobili extus et 

 basi intus tuberculato ; digito externo basi intus tuberculato, extus mar- 

 ginato, punctato. Carpo lato, oblique truncate, parce punctato, intus 

 subtuberculoso, spina interna media valida, interdum alia basali parva ; 

 subtus spinis duabus obtusis anticis, tertia minori interna. Brachio 

 brevi, loevi, spinis duabus anteapicalibus oblique positis, subtus spinis 

 biseriatis acutis. Pedibus tertiis articulo tertio unguiculato ; quartis 

 capitulo basali, ovoideo, quintis subnullo. Pedibus abclominalibus bre- 

 vibus, valiclis, contortis; intus latis, planis; extus medio crassioribus ; 

 parte interna breviori, cylindrica, apice inflexa, conica, acumine parvo, 

 compresso ; parte externa dente longo apicali subito incurvo, extus 

 fusco-corneo, striate 



Forma II. differt chela plerumque heviori; pedibus abdominalibus 

 basi articulatis ; parte interna apice obtusion ; parte externa dente 

 apicali latiori, vix separato, breviori, obtuso, extus nee fusco-corneo nee 

 striato. 



Marem vidi magnum pedibus abdominalibus similibus sed basi non 

 articulatis ; chelis magnis, lsevioribus, digitis angustioribus. 



Femina differt abdomine latiori, basi angustato ; ventre inter pedes 

 quartos nudo ; annulo transverso, modice crasso, lumine denticulate pos- 

 teriori, sulco anteriori longitudinali. 



(Maxim.) Long. corp. 2.9 ; antenn. 2.5 ; ped. antic. 2.3. 



Habitat : Athens, Georgia ; South Carolina. 



Vidi specimina multa et juniora. 



Juniores laeviores, acumine variabili, rostro interdum longiori. 



I have examined a female type in the Mus. Acad. Philad. of C. lati- 

 maims LeConte. It is the largest seen by me, and has the dimensions 

 given by Mr. LeConte, long. corp. 3.3. 



Cat. No. 236, Athens, Ga., Dr. J. LeConte. Male. Fern. Spec. 12 * 



Cat. No. 1849, Milledgeville, Ga. Male. Spec. 1. 



Dry Spec, South Carolina, Mr. L. R. Gibbes. Male. Spec. 1 ; la- 

 belled A. Bartonii Gibbes. 



29. Cambarus Mexicanus Erichson. 



Cambarus Mexicanus Erichson, "Wiegmann's Arclnv, No. 20, T. 12 p 99. 



" Chelis granulatis, gracilibus, subcylindricis, carpis muticis, rostro 

 lato, apice obtusiusculo." 



" Thorax somewhat compressed, always densely punctulated ; cretae 

 prominent, divergent behind ; rostrum nearly flat, broad, obtuse at the 



