62 Notes on North American Crustacea. 



Xanthodius, nov. gen. 



Carapax perlatus, postice planatus, antice vix declivis; margine 

 antero-laterali leviter quadrilobato. Palatum colliculo instructum ad 

 marginem anticum non prodiictum. Antennae articulus basalis fronti v. 

 processui frontis jiinctus; pars mobilis hiatum orbitaa occnpans. Max- 

 illipedum externorum mcrus latus, brevis, angulo externo subdilatatus, 

 margins antico rectus. Chelipedura digiti apicibus excavati. Abdo- 

 minis maris segmenta tertium, qnartum, quintumque coalita. 



This genus differs from Chlorodius in the ridge on palate or 

 endostome. It is allied to Xantlio and Ozius in the shape of 

 the carapax. 



Xaiithodius sterifttoergliii, nov. sp. 



Carapax depressed, dark-reddisli, distinctly tliougb not prominently 

 areolated; surface rugulose or as if eroded anteriorly. Antero-lateral 

 margin somewhat acute, four-parted, teeth little prominent. At the ante- 

 rior tooth the margin is blunt and rugulose. Front a little projecting, 

 somewhat sinuous, emarginated at the middle ; its lateral lobes are 

 deflected to meet the basal joint of the antenna3. Orbits small, rounded. 

 Chelipeds not very stout ; upper margins of carpus and hand rugulose ; 

 fingers black, toothed within, and with a spoon-shaped cavity at their 

 apices not circumscribed within. Ambulatory feet nearly smooth ; 

 dactyli tomentose. Abdomen of male narrow. Dimensions of the 

 carapax in a male : length, 0*62 ; breadth, 1-05 inch. 



Found at Panama by J. H. Sternbergh, Esq. 



Chlorodius long^iinanus. 



Chlorodius longimanus, M.-Edw. ; Hist. Nat. des Crust, i. 401. 

 Florida Keys. 



