46 astacid^. 



articulo basali dente medio infero ; lamina rostro pedunculoque anten- 

 narum longiori, ante medium latiori, margine externo latius inflate-, 

 spina apicali acuta longiori. Epistomate lato, rotund ato, antice medio 

 subacuto ; pedibus maxillaribus externis intus barbatis. Thorace an- 

 gusto, compresso, punctato, lateribus scabris ; linea profunda, sinuata, 

 lateribus fissa ; spina brevi valida, postice leviter barbata, aliaque infera 

 acuta ad antennarum basin ; areola plana, punctata, angusta, postice 

 latiori. Postabdomine lato, compresso, thorace longiori, parcepunctato, 

 segmentis penultimis angulo externo subrecto ; lamina media parte 

 basali quadrangulari, apice utrinque trispinosa; parte apicali aequali, 

 apice angulis rotundatis. Pedibus anticis longis, gracilibus, angustis; 

 chela elongata, angusta, depresso-cylindrica, leviter squamoso-tubercu- 

 lata ; margine interno longo, recto, subdentato ; digitis paulo breviori- 

 bus, rectis, subcostatis, intus squamosis ; digito mobili margine externo 

 subdentato. Carpo longo, angusto, parce tuberculato, spina antica et 

 media interna breviori ; subtus spina antica externa ; brachio longiori, 

 sublsevi, spinis duabus anteapicalibus oblique positis ; subtus biseriatim 

 spinoso, utrinque ad articulationem spina antica acuta. Pedibus se- 

 cundis chela parce villosa; pedibus tertiis et quartis articulo tertio 

 unguiculato ; pedibus quartis et quintis capitulo basali, quartis oblongo 

 majori, quintis compresso, triangulari, erecto. Pedibus abdominalibus 

 validis, brevibus, rectis ; parte externa spina anteapicali acuta, obliqua ; 

 parte externa dentibus perparvis fusco corneis adpressis. 



Forma II., differt pedibus tertiis et quartis unguiculo minori ; chela 

 laeviori ; pedibus abdominalibus basi articulatis, parte interna spina 

 anteapicali fortiori ; parte externa apice rotundato ; intus ad apicem 

 fortiter sulcatis. 



Femina junior differt chela brevi, minori ; ventre inter pedes quartos 

 lcevi ; annulo transversali, valido, fissura longitudinali antica recta, 

 postica dentato-tuberculata. 



Long. corp. 2.9 ; antenn. 2.4 ; ped. antic. 1.9. 

 Patria : Florida. Museum Boston Natural History Society. 



I have seen only one male of each form (the male of the second 

 form is even a little larger), and two very young females. This species 

 is very near C. Le Contei, but differs in the longer thorax, the hands, and 

 the abdominal legs. The legs, especially in the second form, are strongly 

 sulcated on the inner side. 



