THE GKAPSOID CEABS OP AMEEICA. 281 



of last pair ovate-lanceolate, much broader and flatter than in the 

 other pairs. 



The four American specimens differ from P. spectdbilis from 

 Gaboon in having the postero-lateral margins less convergent behind 

 the third side tooth and that tooth a little farther fof ward, and also 

 the dactylus of the fourth leg is flattened and broadened so that it 

 does not resemble the other dactyli as much as in the figured type. 



Measurements. — Male, holotype, median length of carapace 42.5, 

 width of same 51 mm. 



Ilahitat. — Lives in holes in clay banks, just above water line (Nel- 

 son and Goldman). 



Range. — Mexico. 



Material examined. — 



Macuspana River, Montecristo, Tabasco, Mexico; 140 miles from 

 the sea, altitude over 100 feet; May 7, 1900; Nelson and Goldman, 

 Biol. Survey, U. S. Dept. Agri.; 2 males (1 is holotype) (23TG1). 



Mexico: Mexican Exhibit at World's Columbian Exposition, 

 1893; 1 male (19863). 



"Gulf of Mexico"; 1 male (Copenhagen Mus). 



Locality unknown; 1 large claw (Halifax Mus.). 



Genus EUCHIROGRAPSUS Milne Edwards. 



Eucliirograpstis Milne Edwards, Ann. Sci. Nfit., ser. 3, Zool., vol. 20, 1853, 

 pp. 175 [141] ; type, E. Hguricus Milne Edwards. 



Surface hairy. Carapace nearly square, slightly convex, regions 

 indistinct. Antero-lateral angle acute; lateral margins tridentate. 

 Front not more than half width of carapace, advanced, horizontal, 

 bilobed. Orbit with an outer notch; the customary tooth near the 

 inner angle is minute. The basal joint of the antenna closes the or- 

 bital hiatus, the antenna entering the orbit. Antennules nearly trans- 

 verse. Epistome well defined, very short fore and aft, lower edge 

 arched upward. Buccal cavity broader than long, widening ante- 

 riorly. Outer maxillipeds little separated. Ischium longer than 

 merus, and longer than broad, widening anteriorly. Merus broader 

 than long, outer angle rounded and prominent, inner side oblique, 

 antero-internal angle notched for insertion of palp. The merus of 

 the first pair of maxillipeds is not bilobed, being destitute of the 

 inner lobe. 



Chelipeds subequal, shorter and stouter than the legs. Hands 

 angular, fingers pointed. Legs slender, flattened; dactyli spinous 

 and acute. 



The third to sixth segments of the abdomen are more or less fused. 



Distribution. — Mediterranean, eastern Atlantic Ocean, West Indian 

 reffion. 



