THE GRAPSOID CRABS OF AMERICA. 353 



Surface closely covered with depressed granules ; lateral regions with 

 fine oblique granulated striae. A very short denticulated marginal 

 line runs back from the obtuse orbital angle; this line is longer and 

 more marked in young individuals. 



Fronto-orbital width in the adult about two-fifths, in the half- 

 grown about one-half, of the total width of the carapace. Front 

 curved downward and backward, distinctly widening below, lower 

 edge straight and horizontal, not visible from above, lateral edges 

 sinuous. Height of orbit about two-thirds of its width ; upper edge 

 rimmed, subentire and continuous with the frontal margin; lower 

 edge irregularly denticulate. 



The lower surface of the carapace is granulate and for the most 

 part crossed by broken lines of granules. The outer maxillipeds 

 reach to the anterior of the antennular cavities, 

 thus concealing the epistome and both paii*s of 

 antennae. The ischium measured on its outer margin 

 is but little longer than the merus and not much 

 longer than its own width. The articulation of the 

 two segments is very oblique. The merus is not 

 notched for the insertion of the palpus. 



Chelipeds equal, massive, but not extraordina- 

 rily enlarged, surface granulous like the carapace; 

 lower edges of arm more or less spinulous or 

 denticulate, upper edge rugose ; inner edge of wrist ^.^g KpmcoLA, ab- 

 rounded, and armed with a few spines on the domkn or malb 

 distal half; hands broader than their superior ^^.^^ natcual 

 length; fingers rough with fine horny, appressed 

 spinules, prehensile margins irregularly dentate and narrowly 

 gaping. 



Legs of moderate length; merus joints roughened anteriorly with 

 rugose lines; carpus with one or two anterior rows of spines; pro- 

 podi with 4 rows of stout, horny-tipped spines; dactyli with G rows 

 of the same. The propodi are considerably longer than wide, but 

 shorter than the dactyli. 



Terminal segment of male abdomen about half as wide as sixth 

 segment. 



Color. — A female of medium size (32722) was colored as follows: 

 Carapace, eyes, wrists, and greater part of arms, also carpal and 

 meral segments of ambulatories, almost black, with a purplish tinge. 

 A small light yellowish spot near postero-lateral angle of carapace. 

 Last two joints of legs red, distal part of spines yellow, tips horn 

 color. Basal portion of legs and margins of arms mixed red and 

 yellow. A red and yellow patch below orbit. Claws dark purplish 

 proximally, rest of palm and fingers orange-yellow. A small yel- 



G3SG3— 17 23 



