THE CANCROID CRABS OF AMERICA 533 



more hairy than chelipeds. The crest of the carpus in the first three 

 pairs only has two spines above, one near each end, forming a crescent. 



Color. — Carapace and legs russet brown. Palms rose color, 

 fingers deep brown. 



Measurements. — Male (33274), entire length of carapace 10.2, 

 width excluding spines 14.6, including spines 15.5, fronto-orbital 

 width 9, width of front 4.3 mm. Male (Gulf of California), length 

 of carapace 19, width 27 mm. (Lockington). 



Range. — From San Diego, California (Faxon) to Valparaiso, Chile. 



Material examined. — 



MEXICO.— Los Coronados Island; imbedded in coral ^*; 1 female; 

 returned to Mrs. Kate Stephens, San Diego Society of Natural 

 History. 



Maria Madre Island; California Acad. Sci.: E. part of bay; 5-8 

 meters; May 17, 1925; F. Contreras; 2 males (62700). 4-10 fathoms; 

 2 males, returned. 



PANAMA.— Capt. J. M. Dow; 2 males, 3 females (2146). March 

 12, 1891; Albatross; 1 male (20603). Low tide, rocks; May-July, 

 1924; E. Deichmann; 1 male, soft shell (60742). 



Taboguilla Island; Albatross: 1 fathom; low tide, from coral; 

 October 31, 1904; 4 males, 2 females, 1 young (33274). Between tide- 

 marks; October 31, 1899; 1 male, 1 female (M.C.Z.). 



Genus ACIDOPS Stimpson 



Acidops Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, 1871, p. 110 [20]; 

 type, A. fimbriatus Stimpson. — A. Milne Edwards, Crust. R6g. Max., 

 1880, p. 301. 



Carapace broad, smooth, with convex antero-posterior and nearly 

 plane transverse dorsal outline; surface nearly even. Antero-lateral 

 margin short, acute, with three inconspicuous teeth, besides the angle 

 of the orbit. Eyes and orbits elongate, resembling somewhat those 

 of certain Macrophthalmoids. Orbits destitute of teeth or fissures. 

 Eye-peduncles flattened, with an acute anterior edge continuous 

 with the margin of the carapace. The basal article of the external 

 antennae fills the orbital hiatus and just reaches the front. Chelipeds 

 short. Legs broad and compressed except the dactyli which are 

 narrow. Abdomen of male with the third segment much produced 

 on either side; appendages of first pair broadly laminate at base, 

 geniculated at the posterior third of their length and tapering to a 

 fine point somewhat incurved toward the extremity and reaching to 

 the penult segment of the abdomen; those of the second pair two- 

 thirds as long as the first, slender, cylindrical, and tapering to a fili- 

 form extremity. 



" Of this coral Dr. T. Wayland Vaughan says, "probably near Pocillopora capitata Verrill, which is 

 found along the west coast of America from Lower California to Panama." 



