THE CANCROID CRABS OF AMERICA 469 



Antero-lateral border distinctly marked, almost limbed, and furnished 

 with five teeth, including the orbital tooth which is small and little 

 prominent; second, third, and fourth teeth subequal, fifth much smaller. 

 From it a crest extends obliquely inward and backward on carapace. 



Chelipeds not very unequal, covered with large tubercles or nodules, 

 five or six on the carpus, nine or ten on the manus, A granulated 

 longitudinal ridge on outer surface of manus; immovable finger with 

 two carinae, the lower of which extends back on the palm. Dactylus 

 with a deep superior furrow. The fingers of the larger cheliped when 

 closed leave a small hiatus at base, those of the smaller cheliped either 

 have a smaller hiatus or fit tight together. Legs sparsely hairy. 



Measurements. — Male, type of insculpia, length 0.12 inches (3 mm.), 

 width 0.17 inches (4.3 mm.). Male (57145), length 3, width 4 mm. 

 Male, type of pusillus, a postlarval stage, length 2.4, width 3 mm. 

 Miss Boone gives for insculpta, length 12, width 14 nmi.; this propor- 

 tion is impossible and is not borne out by her Figure 74 A. 



Range. — From Cape St. Lucas, Lower California, Mexico, to the 

 Galapagos Islands. 



Material examined. — Galapagos Islands: 



Reef north of Tagus Hill, Tagus Cove, Albemarle Island; March 16, 

 1899; Hopkins Stanford Galapagos Expedition; 2 males, co types 

 (Stanford Univ. and 24832, U.S.N.M.). 



Oft" Eden Island, northwest of Indefatigable Island; April 1, 1923; 

 Williams Galapagos Expedition; 1 male (N. Y. Zool. Soc), 1 young 

 (57745). 



PARAXANXmAS SULCATUS (Faxon), new combinaUon 



Plate 189, Figures 2 and 3 



Xanthodes sulcatus Faxon, Bull. Mus. Comp. Zool., vol. 24, 1893, p. 152 (type- 

 locality, oflf Panama, 153 fathoms, station 3391; type, the measured male, 

 M. C. Z ); Mem. Mus. Comp. Zool., vol. 18, 1895, p. 17, pi. 3, fig. 2, 2a. 



Xanthias sulcatus Rathbun, Bull. Lab. Nat. Hist. State Univ. Iowa, vol. 4, 1898, 

 p. 271. 



Diagnosis. — Carapace suboval. Lateral teeth very small. Gran- 

 ulation and tub ere Illation inconspicuous. Legs slender. 



Description. — Carapace very convex from before backward, gran- 

 ulated, granulation coarsest on lower surface and near borders of 

 upper surface. Deeply impressed grooves separate the gastric from 

 the branchial regions, and the mesogastric from the lateral gastric 

 lobes. The median groove which extends from the mesogastric 

 region to the front is crossed a short distance behind the frontal mar- 

 gin by a transverse groove, which meets on each side another groove 

 running parallel to the upper margin of the orbit; in this way there 

 are marked off a pair of frontal and a pair of orbital areolets. Frontal 



