44 ASTACIDiE. 



t 



infero ; lamina rostro paulo loiigiori, pedunculo antennarum tequali, 

 ante medium latiori, apice angusta, margine externo inflate, apice 

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

 lateribus obliquis, angulis lateralibus rectis. Pedibus maxillaribus intus 

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

 granulosis ; cephalothorace medio la^viori, rarius punctato, postice 

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

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

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

 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- 

 cvlindricis ; chela longa depresso-cylindrica, dense squamoso-tubcrcu- 

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

 chela3 a^qualibus, intus curvatis, gracilibus, carinatis, punctato-ciliatis, 

 intus squauiosis ; 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 Icevi, intus ante apicem et margine supero tuberculato, spinis 

 duabus anteapicalibus oblique positis. Subtus Inseriatim 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 trilms fusco-corneisj 

 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 desciibed and figured by Mr. Harlan, pre- 

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

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

 in the mountains, but Mr. Harlan (in the Trans. Amer. Pliilos. 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 carefidly 

 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. 



Cambarus Clurkii and C. troglodi/tes are very similar, but instantly sepa- 



