THE CANCROID CRABS OF AMERICA 421 



Range. — Gulf of California, Mexico, to Ecuador. 



Material examined. — San Carlos Bay, Sonora, Mexico; March 9, 

 1921; Fred Baker; 1 male (Cal. Acad. Sci.). 



Bay of Panama; F. H. Bradley; cotypes in Peabody Museum; 1 

 male, 1 female, cotypes. Cat. No. 16215, U. S. N. M. 



Panama; 1924; E. Deichmann: Panama Harbor; low tide, lava; 

 May 30; 1 male (60734). Pacific shore of Panama; low tide, rocks; 

 May-July; 2 males (60735). 



Taboga Island, Bay of Panama; May 11-15, 1911; Meek and 

 Hildebrand, Smithsonian Biological Survey; 1 male, 1 female (Cat. 

 No. 44188, U. S. N. M.); 1 female (Field Mus.). 



South side Point Santa Elena, Ecuador; September 17, 1926; W. L. 

 Schmitt; 1 female, 1 young (60736). 



Salinas, Ecuador; under rocks; September 12-15, 1926; W. L. 

 Schmitt; 60 males, 74 females (33 ovigerous) (60873-60875, 60920). 



EURYPANOPEUS PLANISSIMUS (Stimpson) 



Plate 175, Figures 1, 2, and 6 



Xantho planissima Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1860, p. 205 

 [77] (type-locality, Cape St. Lucas; cotypes in M. C. Z.). 



Panopeus planissimus Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, 1871, 

 p. 108. — Benedict and Rathbun, Proc. U. S. Nat. Mus., vol. 14, 1891, p. 370, 

 pi. 21, text-fig. 5, pi. 24, figs. 1 and 2. 



Eurypanopeus planissimus A. Milne Edwards, Crust. R6g. Mex., 1880, p. 322. 



Diagnosis. — Carapace flat, nearly smooth. Chelipeds heavy; 

 carpus with two grooves at right angles; color of immovable finger 

 squared off at proximal end where it encroaches on palm. 



Description. — Carapace perfectly flat above, posterior two-thirds 

 smooth, anterior third finely granulate, slightly rugose. Regions 

 moderately well defined but not themselves areolated excepting the 

 gastric in its anterior part. Front arcuate up to the small distinct 

 outer lobules, median notch small; edge thick. Outer orbital tooth 

 small, triangular, separated by a shallow sinus from the second lateral 

 tooth; remaining emarginations V-shaped; third tooth obtusely 

 angled, fourth and fifth subacute. Subhepatic tubercle large, sub- 

 laminar. 



Chelipeds massive; carpus with a tuberculiform inner tooth and a 

 groove subparallel to the distal margin; the groove widens out- 

 wardly; on its proximal margin near the inner end there are two 

 tubercles separated from each other by a short groove at right angles 

 with the first. Manus high, height exceeding length of upper margin, 

 surface punctate and finely granulate; a row of dimples on outer 

 surface below upper edge. Immovable finger broad at base where 

 there are two large prehensile teeth in a line parallel with lower 

 margin; color continued backward in a rectangular patch on palm 

 where it ends in a vertical line and is not continued upward to the 



