116 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



DISSODACTYLUS NITIDUS Smith. 



Plate 26, figs. 6 and 7. 



Dissodactylus nitldus SMITH, Trans. Connecticut Acad. Arts and Scl., voL 

 2, 1870, p. 173 (type-locality, Panama; type in P.M.Y.U.). HATH- 

 BUN, Proc. U. S. Nat. Mus., vol. 38, 1910, p. 545, pi. 48, fig. 6. 



Diagnosis. Carapace mostly flat. Dorsal ridge covering one- 

 third of distance to median line. Dactyls of legs, 1, 2, and 3 bifur- 

 cate halfway to base. Terminal segment of male abdomen nearly an 

 equilateral triangle. Palp of outer maxilliped 2-jointed. 



Description of male. Carapace broad posteriorly, breadth at pos- 

 terior margin but little less than between lateral angles; postero- 

 lateral margins about as long as antero-lateral. Dorsal surface naked 

 and polished, slightly convex in front and along lateral margins, flat 

 in middle and posteriorly. Antero-lateral border slightly arcuate, 



FlG. 64. DlSSODACTTLUS NITIDDS, OUTEtt MAXII-LIPED OF FEMALE (22113), X 60. 



armed with an upturned margin which curves suddenly inward at 

 lateral angle and extends one-third of way to middle of carapace; 

 postero-lateral border nearly straight and armed with a slightly 

 upturned margin. 



Distal half of merus of outer maxillipeds suboblong, with straight 

 and parallel sides, distal angles rounded; segments of palp long, the 

 tip when flexed reaches anterior margin of sternum; second segment 

 spatulate, distal end broad and squarely truncate, with what seems 

 to be a rudiment of a dactylus at the flexor, distal angle. 



Merus of chelipeds extends but little beyond margin of carapace; 

 carpus short, smooth, unarmed; hands smooth, rounded, somewhat 

 swollen ; fingers slender, acutely pointed, slightly deflexed, prehensile 

 edges minutely dentate; a small tuft of dense pubescence on lower 

 edge of propodal finger near base. 



Legs slightly hairy along edges, merus, carpus, and propodus joints 

 somewhat compressed; dactyli 1, 2, and 3 smooth, naked, divided 



