368 BULLETIN 129, UNITED STATES NATIONAL MUSEUlM 



is postero-lateral, separated from the fifth tooth by a tubercle, and 

 situated above the margin, forming an arcuate line with the other 

 teeth but above their level. Granules and tubercles of carapace 

 more numerous than in P. quinquedentata; there are about 50 small 

 granules on the cardiac region and 40*on the mesogastric region; the 

 granules of the postbranchial region are large and spinous. One 

 or more hairs curved at tip arise from each tubercle or granule. An 

 uninterrupted row of large transverse tubercles above margin. Orbi- 

 tal teeth acute, the outer one advanced nearly as far as the inner. 

 First movable article of the antenna shaped much as in P. quinque- 

 dentata. Chelipeds weak; manus compressed, margins tapering 

 toward extremity. 



Measurements. — Male, Cape St. Lucas (Paris Mus.), length of 

 carapace 14.2, width 13.8, width exclusive of spines 12, width be- 

 tween outer orbital angles 7 mm. Female, Cape St. Lucas (M. C. 

 Z.), length of carapace 16.3, width 15.8, width exclusive of spines 

 13.7, width between outer orbital angles 7.4 mm. Female (Bell), 

 length 9 lines (22.8 mm.), width 8 lines (20.3 mm.). 



Range. — Cape St. Lucas, Lower California, Mexico; Galapagos 

 Islands. 



Material examined. — 



Cape St. Lucas; John Xantus; 1 male, 1 female (55116), 12 males, 

 9 females (1225, M. C. Z.), 1 immature female (British Mus.). 



Cape St. Lucas; A. Milne Edwards; 1 male (Paris Mus.). 



Galapagos Islands; one specimen (Paris Mus.). 



Remarlcs. — In this species there is in some individuals a tendency 

 to a slight union of the second and third teeth at their base. 



PITHO ANISODON (von Martens) 



Plate 131; plate 251, fig. 2 



Othonia anisodon von Martens, Arch. f. Naturg., vol. 38, pt. 1, 1872, p. 83, 



pi. 4, fig. 3 (type-locality, Cuba; cotypes in Berlin Mus.). 

 Othonia aculeata Kingsley, Proc. Acad. Nat. Sci. Philadelphia, 1879 (1880), 



p'. 388 (part). 

 Othonia Iherminieri Rathbun (not Schramm), Proc. U. S. Nat. Mus., vol. 



15, 1892, p. 255, pi. 34, figs. 3 and 4 (not all synonymy). 

 Pitho anisodon Rathbun, Ann. Inst. Jamaica, vol. 1, 1897, p. 8; Bull. Lab. 



Nat. Hist. State Univ. Iowa, vol. 4, 1898, p. 258; Bull. U. S. Fish. Comm., 



vol. 20, for 1900, pt. 2 (1901), p. 77. 



Diagnosis. — Lateral teeth of carapace five, acute; second tooth 

 much reduced and united at base with third tooth. Fronto-orbital 

 distance short. Palms of old male long and narrow. Distal third of 

 male appendages lyre-shaped. Lobe of first movable segment of 

 antenna small, forward-pointing. 



Description. — Carapace oval, with the anterior margin narrow. 

 Width between outer angles of orbits but little more than half the 



