312 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



Diagnosis. — Carapace about one and three-fourths times as wide as 

 long; antero-lateral margin thin. Edge of front visible in dorsal view. 



Description. — Carapace depressed, distinctly though not promi- 

 nently areolated; surface punctate and rugulose or as if eroded 

 anteriorly. 2 M divided for half its length, the furrow continued 

 forward toward the fron to-orbital notch; 2 L and 3 L posteriorly 

 confluent. Antero-lateral margin somewhat acute, four-parted, teeth 

 or lobes little prominent, only the last two showing a blunt point; 

 margin at anterior tooth blunt and rugulose. Front a little pro- 

 jecting, sinuous, slightly emarginate at middle, a short furrow leading 

 back from the notch; lateral lobes of front deflected and bent inward. 

 Orbits small, rounded. 



Chelipeds not very stout; upper portions of wrist and hand rugulose; 

 fingers rather narrow, a spoon-shaped cavity at their tips; dark color 

 of immovable finger of major cheliped prolonged a little on palm. 

 Ambulatory legs scantily hairy on lower margin; dactyli tomentose. 

 Abdomen of male very narrow from the middle of the fourth segment. 



Color. — Dark reddish, fingers black (Stimpson). 



Measurements. — Male (48802), length of carapace 19.4, width 34.2, 

 fronto-orbital width 13, front 7.8 mm. 



Range. — Cape St. Lucas (A. Milne Edwards) ; Panama to Peru. 



Material examined. — Cape St. Lucas, Mexico; 1 young, 5.4 mm. 

 wide (17541); identification probably correct. 



Panama; Doctor LeConte and A. Agassiz; 5 males, 5 females (3 

 ovigerous) (415, M.C.Z.); identified by Stimpson. 



Panama, Panama; tide pools; March 21, 1912; Smithsonian 

 Biological Survey; 1 male (59334). 



Panama, Panama; James Zetek: December 12, 1913; 1 male 

 (48802). December, 1914; 1 male (48804). 



Balboa, Canal Zone; February 7, 1912; Smithsonian Biological 

 Survey; 1 male (Field Mus.). 



Taboga Island, Bay of Panama: June, 1914; James Zetek; 4 males, 



2 females (48788), 5 males, 2 females (48796). May, 1927; Mel- 

 bourne Ward; 1 male, 1 female; returned. 



Taboguilla Island, Bay of Panama; between tide marks; October 

 31, 1899; Albatross; 3 males, 5 females (33282), 2 males, 2 females 

 (M.C.Z.). 



Perico Island, Bay of Panama; October 26, 1904; Albatross; 1 male 

 (33265). 



Panama, Panama; low tide, rocks; May-July, 1924; E. Deichmann; 



3 males, 1 female (60832). 



Salinas, Ecuador; September 12-14, 1926; W. L. Schmitt; 1 

 female (60968). 



Paita, Peru; 1873; Dr. W. H. Jones, U. S. Navy; 1 male, 1 female 

 (2381, M.C.Z.). 



