44 ASTACIDiE. 



infero ; lamina rostro paulo longiori, pedunculo antennarum aequali, 

 ante medinm latiori, apice angusta, margine externo inflato, apice 

 brevi-spinoso. Epistomate longitudine vix latiori, antice rotundato, 

 lateribus obliquis, angulis lateralibus rectis. Pedibus maxillaribus intns 

 et subtus barbatis. Thorace leviter ovali, grosso-punctato, lateribus 

 granulosis ; cephalotliorace medio lseviori, rarius punctato, postice 

 bicalloso ; linea orclinaria profunda, sinuata, utrinque fissa, spina laterali 

 mediocri, spinaque infera apicali ; areola angusta, profunda, postice 

 paulo latiori, punctata. Postabdomine thorace vix angustiori, laevi, 

 segmentis penultimis angulo externo postico recto ; lamina media 

 parte apicali vix breviori, margine apicali medio vix exciso ; parte 

 basali apice utrinque bispinosa. Pedibus anticis valde elongatis, sub- 

 cylindricis ; chela longa depresso-cylindrica, dense squamoso-tubercu- 

 lata, margine interno longo recto, subdentato ; digitis margine interno 

 chelce aequalibus, intus curvatis, gracilibus, carinatis, punctato-ciliatis, 

 intus squamosis ; digito interno paulo longiori ; carpo longo, angusto, 

 antice oblique truncato, intus tuberculato, spina interna media, aliaque 

 antica minori, spinis duabus inferis anticis ; brachio rostro longiori, 

 extus laevi, intus ante apicem et margine supero tuberculato, spinis 

 duabus anteapicalibus oblique positis. Subtus biseriatim spinoso, spina 

 utrinque antica ad articulationem. Pedibus tertiis et quartis articulo 

 tertio valde unguiculato ; pedibus quartis capitulo basali ovali, com- 

 presso ; quintis perbrevi, acuto. Pedibus abdominalibus validis, rectis ; 

 parte interna breviore, recta (dente apicali fracto) ; parte externa 

 latiori, subcontorta, apice non angustiori ; dentibus tribus fusco-corneis, 

 medio longiori, antico lato, contorto, postico parvo, angusto, fere recto. 



Long. corp. 3.8 inch ; ped. ant. 3.9. 



Patria : Camden, South Carolina (mas. Form I.) 



I have only seen the type described and figured by Mr. Harlan, pre- 

 served dry in the Museum of the Philadelphia Academy, and labelled, 

 "A. Blandingii Harlan, Camden, S. C, Dr. Blanding." Camden is situated 

 in the mountains, but Mr. Harlan (in the Trans. Amer. Philos. Soc. 1. c.) 

 says : " All the crawfish which I have seen from the Southern States, 

 and I have received specimens from New Orleans and South Carolina, 

 are the same species with that now described." I have most carefully 

 examined several hundred specimens from New Orleans and South 

 Carolina, (the collection in the Museum of Cambridge being very rich 

 for these localities,) but I have not found a single specimen of C. Blan- 

 dingii. The description and the figure given by Mr. Harlan agree very 

 well with his type ; but the hand is no broader at the base than seen 

 in the right hand of the figure. The hand is two inches long;, the 

 inner finger seems when open 0.1 inch longer than the external, it is 

 as long as the hand, 1 inch. 



Cambams Clarkii and C. troglodytes are very similar, but instantly sepa- 



