THE GRAPSOID CBABS OF AMERICA. 413 



Panama: 1 male (20277). Dr. Maack; 2 males (22181). A. 

 Agassiz, 2 males (22182). 

 ?Panama; 1 male (177GG). 

 Payta, Peru; Dr. W. H. Jones, U.S.N. ; 5 specimens (M.C.Z.). 



UCA URUGUAYENSIS Nobili. 



Plate 150. 



TJca nrugiiaycnsis Norili, Boll. Mus. Zool. Anat. corup. R. Univ. Torino, 

 vol. IG, 1001, No. 402, p. 14 (type-locality, La Sierra; type in Turin 

 Mus.). 



Diagnosis. — Fourth to sixth abdominal segments in male fused. 

 Oblique ridge inside of palm terminating at carpal cavity. Carapace 

 widest at antero-lateral angles. 



Description. — This species resembles the group which includes U. 

 speciosa, U. crenulata and U. coloradensis, but differs from all in 

 having the fourth, fifth, and sixth segments of the male abdomen 

 fused. 



Carapace very convex in both directions, sulci of moderate depth, 

 surface smooth. Width of front less than one-fourth width of cara- 

 pace. Upper margin of orbit oblique. Side margins of carapace 

 straight and sloping backward and inward, then turning at an angle 

 as in the allied species. 



Arm and wrist sparsely roughened. Palm granulate outside, 

 granules increasing in size and prominence from below upward. 

 The palm curves over to upper margin much as in U. speciosa. 

 Ridges of inner surface coarsely tuberculate ; those at base of dactyl 

 are at right angles to lower margin ; the oblique ridge ends at middle 

 of palm; between this ridge and the others the surface is very 

 coarsely granulate. Fingers about one and one-fourth times as long 

 as palm (measured horizontally). Both fingers have several larger 

 tubercles scattered along their prehensile edges. 



Although the fourth, fifth, and sixth segments are fused, there is 

 a faint sulcus between the fourth and fifth. 



Color. — In formalin, uniform red-brown on the carapace and 

 coralline red on chelipeds and legs. 



Measitrements. — Male (22191), length of carapace 10, width of 

 same 1G.5 mm. 



Range. — Rio de Janeiro to Uruguay. 



Material examined. — 



Rio de Janeiro, Brazil; 1876-1877; R. Rathbun; 4 males, 2 females 

 (40024). 



E. Piassaguera, Santos, Brazil; June, 1913; H. Luderwaldt; 1 male 

 (47870). 



