88 astacid^:. 



tato; latere interno tuberculato-spinoso, spina media majori ; subtus 

 spinis duabus anticis modicis. Brachio brevi, margine supero spinoso, 

 spinis duabus anticis oblique positis majoribus; subtus biseriatim spi- 

 noso. Pedibus tertiis articulo tertio unguiculato ; pedibus quartos capi- 

 tnlo basali orbicnlari. Pedibus abdomiualibus gracilibus, rectis, parte 

 interna angustiori cylindrica, apiee acuta elongata ; parte externa apice 

 subinflata, dente fusco-corneo, extus striate, triangularis compresso, acu- 

 minato. 



Forma II. Pedibus abdomiualibus basi non articulatis, parte interna 

 apice crassiori, breviori; parte externa apice magis inflata, brevi, conica, 

 subacuta, nee fusco-cornea. 



Femina abdomine vix latiori, ventre inter pedes quartos nudo; an- 

 nulo fere orbicnlari. antice subbituberculato, lumine centrali. 



Long. corp. 2.1; antenn. 1.3; ped. antic. 1.4. 



Habitat: Georgia; Carolina (Erichson). 



I have seen twenty specimens ; the males are younger, the male 

 Forma II. is very young; its abdominal legs are not articulated, never- 

 theless it has the shape commonly observed in the second form. 



This species is similar to C. advetia, but differs as follows : the rostrum 

 is more triangular, the thorax strongly punctulated, the areola not im- 

 pressed ; the apical part of the median lamina is longer, the rib in the 

 lateral lamina ends before the margin; there are no spines at the basal 

 joints of the smaller antennae ; the carpus beneath and on the inside 

 has numerous spines; the lateral margins of the postabdomen are not 

 straight, but every segment is more rounded on the outside; the sexual 

 parts differ visibly. 



I think this species is the C. Carolinus Erich. The description seems 

 to agree very well; the obviously small postabdomen, the more pointed 

 lamina of the antennae, and the linear areola are the chief characters 

 mentioned by Erichson. The subsequent addition, that the males have 

 only the third pair of legs hooked, places the C. Carolinus without doubt 

 in this group. All the other species of the groiq), except C. obesus, are 

 immediately seen to differ in having a larger areola, but the enlarged 

 postabdomen separates them from the species described by Erichson. 



Cat. No. 232, Charleston, S. C, Professor L. Gibbes. Male. Fein. 



Spec. 2. 



Cat. Xo. 1850, Georgia. Male. Spec. 1. 



Cat, No. 230, Mobile, Ala., Mr. Forbes. Male. Fern. Spec. 12 * 



Cat. No. 275, Mobile, Ala., L. Agassiz. Male. Spec. 1. 



Dry Spec., Georgia. L. Agassiz. Male. Spec. 1. 



