﻿2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 59 



with the naked eye; on the frontal and lateral regions many of the 

 granules are coarser and more elevated ; punctae fine but visible with- 

 out a lens. A deep median furrow runs between the epigastric lobes 

 and is continued to the front forming a V-shaped notch in the upper 

 margin. This margin viewed from above is convex, bending back- 

 ward at the sides so that it meets the orbital margin on the dorsal 

 plane ; its edge bears a row of tubercles and projects over the concave 

 surface of the front, but does not conceal the lateral margins of the 

 front or the lobes of the inferior margin ; this last, is sinuous while 

 the side margins are oblique ; front deepest toward the outer ends. 

 The lateral margins of the carapace are distinctly serrate, the teeth 

 smaller in front of the cervical suture ; in addition there is an ill- 

 marked hepatic tooth, and on the right side only an indication of a 

 cervical tooth. The orbits in front view are large compared to the 

 eyes and are subrhomboidal with the sides of the rhomb subparallel ; 

 upper margin with shallow crenulations, lower margin with deeper 

 ones and a rounded notch below the outer angle. 



Maxillipeds rather broad, the outer margin of the merus rounding 

 gradually into the anterior margin ; ischium much wider anteriorly 

 than posteriorly. Exognath reaching about half length of ischium. 

 Chelipeds very unequal, stout. Merus with outer margin serrate and 

 rugose, lower margin tuberculate, inner upper margin armed with 

 coarse spines, below a few of which there is a tubercle ; carpus rough 

 with granulated rugae ; inner spine very sharp ; chelae covered with 

 coarse punctae; the right or larger palm measures very little longer 

 above than its greatest width, while it is thicker than half its width ; 

 fingers armed with stout teeth which meet, while the tips of the 

 fingers cross. Merus joints of ambulatory legs dilated, upper margins 

 serrulate. 



Dimensions. — Female, total length of carapace, 33.2 mm. ; width, 

 51 mm. ; width between outer angles of orbits, 31 mm. ; superior width 

 of front, 16.7 mm. ; inferior width of front, 13.5 mm. 



Type locality. — Rio Masimbar, Empire, Canal Zone; Feb. 8, 191 1 ; 

 one adult female. 



Type specimen. — Cat. No. 43657, U. S. Nat. Mus. 



Closely allied to P. tuberculata 1 Rathbun, but narrower, front 

 deeper, orbit more rhomboidal, palm of larger cheliped without the 

 large tubercle at base of fingers which is present in tuberculata. 



Bull. Mus. Hist. Nat., Paris, 1897, p. 60. 



