THE GRAPSOID CRABS OF AMERICA. 379 



Description. — Width of carapace at the antero-lateral angles one 

 and one-half times its greatest length. Carapace strongly convex 

 antero-posteiiorly, intei-icgional grooves rather deep. Posterior 

 border a little more than half of anterior. True lateral borders mod- 

 erately convergent. The raised line that bounds the dorsal plane on 

 each side is sinuous and terminates a little in front of the postero- 

 lateral margin and above the base of the last foot. In the male it 

 is finely granulate and ends in a tubercle; in the female it is coarsely 

 bead-granulate throughout. Surface in the male very finely granu- 

 late; in the female coarsely so, especially at the sides. 



The greatest breadth at the front is one-nineteenth of the width 

 of the carapace; the upper surface of the front, or the space inclosed 

 between the margins of the oi-bits, is linear. 



Orbits almost transverse, edges sinuous, the lower one crenated. 



In the large cheliped of the adult male the upper border of the 

 merus is smoothly rounded; inner border armed with blunt, well- 

 separated teeth increasing distally ; outer border with a few granules. 

 "Wrist almost smooth, very finely wrinkled, a few granules. The 

 propodus is one and three-fourths times as long as the width of the 

 carapace, and three times as long as wide; basal portion covered and 

 margined with coarse tubercles; digital portion covered with pits 

 filled with short hair, and bordered by a raised margin, entire below 

 and granulate above. Inner face of palm with a transverse tuber- 

 culate ridge bent at a right angle at the middle. Dactylus broadest 

 at distal third, maigins granulate, a tubercle near distal third of 

 prehensile edge; upper margin convex, lower nearly straight. Both 

 fingers are smooth inside and have an inner granulate ridge on their 

 occludent margins. The immovable finger has a third or intermedi- 

 ate row of granules on this margin which projects in a broad lobe at 

 the proximal third. "When closed the fingers gape for their basal 

 third, and overlap distally, their tips spiniform and crossing each 

 other. In the male the ambulatory legs are nearly smooth. In the 

 female the merus joints are somewhat tuberculate, their upper margin 

 is distinctly denticulate, and the lower margin is tuberculo-dentate; 

 in the last pair the margins are furred with short hair. 



Measurements. — Length of carapace of male (17G57) 22, width of 

 same 34 mm.; female (17G57), length of carapace 20.5, width of 

 same 20 mm. 



Ildhttat. — Salt marshes (Sloane). 



Rnnge. — Jamaica (Sloane). Ca3'enne to Rio de Janeiro. 



Material examined. — 



Cayenne. French Guiana ; specimens in Copenhagen ^lus. 



!Maranli:lo, Brazil: Lieutenant F. E. Sawj^r, U. S. Navy; 13 

 males. 5 females (17G57). Thayer Exped. ; 2 males, 2 females 

 (22190). 



