THE SPIDER CRABS OF AMERICA 161 



Measurements. — Female, holotype, length of carapace 0.31 inch 

 (7.9 mm.), width between tips of antero-lateral teeth 0.25 inch 

 (6.3 mm.). (Stimpson.) 



Range. — KnoAvn only from the type-locality. Cape St. Lucas, Lower 

 California, Mexico. The Peruvian specimen formerly supposed to be 

 a variant of Stimpson's species is now considered a distinct species. 



EUPLEURODON PERUVIANUS Rathbun 



Plate 49, figs. 5 and 6 



Ewpleurodon trifurcatus Rathbun, Proc. U. S. Nat. Mus., vol. 38, 1910, pp. 



535 and 572 (part), pi. 49, fig. 5. Not E. trifurcatus Stimpson. 

 Eupleurodon peruvianus Rathbun, Proc. U. S. Nat. Mus., vol. 64, art. 14, 



1924, p. 2 (tj'pe-locality, north end of Ferrol Bay (Chimbote), Peru; 



holotype. Cat. No. 40462, U.S.N. M.). 



Diagnosis. — Orbital arch provided with a preocular tooth. No 

 small tooth on lateral margin between the two large teeth or lobes. 

 ^Description. — Carapace pentagonal; depressions as in trifurcatus. 

 A transverse row of tubercles across the gastric region above the 

 depression, the inner pair larger than the outer 

 pair; a large tubercle near the posterolateral 

 angle; a smaller one in the branchio-cardiac 

 furrow; a still smaller tubercle on the meso- 

 gastric and the intestinal regions, and three 

 on the cardiac region forming a triangle point- 

 ing backward. Teeth and prominences of 

 carapace setose. Lateral teeth or lobes re- 

 curved,- blunt at tips; width of carapace at 

 middle of antero-lateral lobes greater than at 

 tip of lobes and appreciably less than width 

 between tips of postero-lateral lobes. Ros- 

 trum a third as long as the postfrontal part 

 of the carapace and one-half as broad as long, fig. go.-eupledrodon peruvi- 

 lateral margins raised, extremity incised for anus, female holotype, maxil- 



^ 1 c ■ 1 1 !• LIPED. The CARAPACE IS 10 mm, 



about one-iourth ol its length to lorm two long 

 rounded lobes. Eyestalks flattened. 



The antennae reach nearly to end of rostrum. The antennular 

 cavity reaches to middle of rostrum, is not nearly filled with the 

 antennules, and is very incompletely divided into two fossae. Merus 

 of maxillipeds slightly notched at antero-internal angle; first article 

 of palp flattened, angular, last two articles small and slender, hidden 

 behind the merus. Carpus of cheliped nodose, merus and manus 

 nodose at distal articulations; two low tubercles on upper margin of 

 merus; propodal finger strongly deflexed, dentate; fingers stout, the 

 dactylus with a basal tooth and near the tip a few smaller teeth. 

 Dactyli of legs strongly falcate, finely dentate, the digital tooth of 

 the propodus strong and with hairy tip. 



