in the 3Iuseum of the Sinithsonian Institution. 101 



Of this species there is but one specimen in the collection, a steiile 

 female, the dimensions of which are : Length of the carapax, 0.60 ; 

 breadth, 0.68 inch; proportion, 1:1.133; length of meros of cheli- 

 ped, 0.60 inch. 



Found at Panama by Capt. J. M. Dow, to whom the Insti- 

 tution is indebted for this and man_y other interesting species. 



XdaBHbrw* (1ei>re§s9ii!^eulBi§, uov. sp. 



Body depressed, though much less so than in L. crenulatus. Cara- 

 pax one-fifth broader than long ; regions moderately prominent, 

 the cardiac region most so ; surface covered with scattered, granu- 

 lated tubercles, irregular in size. Branchial region broadly expand- 

 ed. Lateral margin armed with about foui'teen spiuiform, granulated 

 teeth, largest on the outer side of the branchial region ; at the postero- 

 lateral angle they are as long, or longer, than the rostrum. The in- 

 testinal region is broad, and projects but little beyond the line of the 

 postero-lateral angles. Of the fourteen lateral teeth mentioned above, 

 only five properly belong to the postero-lateral margin. The frontal 

 region is concave. The rostrum is small, triangular, and horizontal. 

 Chelipeds of the usual length ; superior surface of the meros with a 

 median row of about five spiniform tubercles ; margins of both meros 

 and hand armed with numerous spiuiform teeth, of which there are 

 about ten on the outer side of the hand. All these teeth of the 

 chelipeds are granulated like those of the carapax, but not ramose. 

 Beneath, the hands are ornamented with longitudinal rows of small, 

 smooth tubercles, largest along the inner edge, and fading out toward 

 the exterior margin. Ambulatory feet slightly compressed, but not 

 crested, and perfectly smooth and unarmed. There is a small, slender 

 spine on the peniilt joint of the abdomen in the male. 



Length of the carapax in a male, 0.85 ; breadth, spines included, 

 1.15 inch ; proportion 1:1.35 ; length of hand, 1.13 inch. 



Found at Manzanillo, Mex., hy John Xantus, Esq. 

 ^olesiolaiiibrii§ aretiatiis, nov. sp. 



Carapax short and broad, with projecting lateral angles. Surface 

 punctate, much more finely than in S. tyiyiciis. Antero-lateral 



