414 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Maldonaclo, Uruguay; J. G. Gary; 1 male, 1 female (2219-1); 19 

 males, 5 females (M.C.Z.). 



Uruguay; F. Felippone; 4 males (39120). 



UCA OERSTEDI Rathbun. 



Plate 152, figs. 1 and 2. 



Vca oerstcdi Rathbun, Proc. Biol. Soc. Washington, vol. 17, 1004, p. IGl 

 ( type-locality, Punta Arenas, Costa Rica ; male holotype in Copen. 

 Mus.). 



Diagnosis. — Carapace deeply areolated; sides strongly angulated; 

 front narrow; oblique and distal ridges on inner side of palm meet- 

 ing. 



Description. — Surface uneven; a deep groove on outer side of 

 gastric and cardiac regions is continued anteriorly in a transverse 

 groove behind orbits, and posteriorly toward postero-lateral angle; 

 a second longitudinal groove outside the first divides the branchial 

 regions unequally. 



Front posteriorly one-sixth as wide as distance between antero- 

 lateral angles, gradually narrowing to a rounded end. Superior 

 orbital margin very oblique and sinuous; eyebrow largely visible 

 from above. Antero-lateral angle little more than a right angle; 

 anterior portion of side margin straight or nearly so, and directed 

 backward and a little outward; the margin then turns abruptly in- 

 ward at an oblique angle and is very concave almost to its posterior 

 end ; the isolated bit of margin above the base of the last foot is very 

 short and convex. 



Large cheliped of male stout. The merus has a laminate and denti- 

 culate upper margin ; outer face with a few scattered scabrous gran- 

 ules. The carpus has similar but more numerous granules; the 

 oblique ridge on its inner face has a few tubercles at the proximal 

 extremity. Palm covered with coarse tubercles outside; a beaded 

 ridge on lower margin. Fingers broad, flat, almost smooth; margins 

 raised; a triangular gape between their basal halves; prehensile 

 tubercles bead-like, a tooth at middle of pollex, and sometimes a 

 larger tubercle at middle of dactylus. Inner surface smooth, except 

 for the tuberculate ridges; the oblique ridge starting frcm the lower 

 margin extends to a point above the middle, then turns at a very 

 prominent right angle toward the supero-distal end of the palm 

 where it joins the longer and more proximal of the two ridges paral- 

 lel to tlie base of the dactyhis. 



Merus of legs broad, margins convex. 



Measurements. — Male, holotype^ length of carapace 12, width of 

 same 1G,8 mm. 



