330 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



Notes on a specimen from Brazil in the museum at Philadelphia. — It 

 appears to be the same species. Although a little larger than the 

 type, the chelipeds are not fully developed, the arm spines less strong, 

 the enlarged tubercles on the fingers almost lacking. Only 5 median 

 spines: 2 gastric, 1 genital, 1 cardiac, and 1 intestinal. Behind the 

 cardiac spine there is a crater-like tubercle. On the gastric region 

 are various spinules, mostly irregularly placed; between the anterior 

 gastric spine and the right spine of the row of 3 (not 5) there is a 

 small spine or spinule situated nearer the median spine; immediately 

 behind the median spine and a little to the left there is a spinule; 

 behind the posterior gastric spine there is a cluster of 6 spinules, of 

 which all are irregularly placed save 2; those 2 make an equilateral 

 triangle with the median spine. A dorsal hepatic spine. Only 1 

 really marginal branchial spine, that at postero-lateral angle; between 

 it and the lateral gastric spine there is a wavy line of 3 spines; on the 

 inner portion of branchial region there is a right-angled triangle formed 

 of 3 spines. Rostrum inclined downward; horns more spreading than 

 in Bell's figure; distance between tips 10.4 mm., or twice the width 

 at base of rostrum. Preorbital spines slenderer and more outstand- 

 ing than in Bell's figure. Three strong pterygostomian spines, as in 

 the type, and at the beginning of the true marginal rim that runs 

 around the postero-lateral and posterior margin. Three short spines 

 on the basal antennal article, one at antero-internal angle, very blunt 

 and lobiform, one acute at antero-external angle, and one a little 

 stouter, on lateral margin. Five spines on upper side of arm, the 

 one at the distal articulation smallest; a row of six small tubercles 

 on outer surface; a few tubercles on proximal end of wrist. 



An adult female from the Canal Zone measures 66.3 mm. long, 

 58.7 mm. wide, including spines, 47.8 mm. wide, excluding spines. 

 It agrees with the Brazilian specimen in most characters; it has, how- 

 ever, a tubercle behind the second gastric spine. Horns spreading 

 nearly as in Bell's figure. Chelipeds weak, upper half of surface of 

 merus and carpus rough with many tubercles. . 



Measurements. — Male type (Bell), total length of carapace 2 inches 

 8 lines (71.1 mm.), width 2 inches 3 lines (58.42 mm.). Male (Brazil), 

 median length 70.4, total length 77.5, width without spines 59.4, with 

 spines 66 mm. 



Color. — Of hair light brown; body itself paler (Bell). 



Range. — Peru, 5 fathoms, soft mud; Panama (Atlantic side); 

 Brazil. 



Material examined. — 



Toro Point, Canal Zone, Panama; January 25, 1912; Meek and 

 Hildebrand, Smithson. Biol. Surv.; 1 adult female (56536). 



Brazil; T. B. Wilson; 1 adult male (Phila. Acad.). 



