THE GRAPSOID CRABS OF AMERICA. 301 



Diagnosis. — Transverse, nearly smooth. Front much more than 

 half width of carapace. Merus of third leg more than two and one- 

 half times as long as wide. 



Description. — Carapace distinctly transverse, of nearlj'' uniform 

 width throughout, regions well marked, surface nearly smooth, punc- 

 tate, toward the front rough with squamiform granules. Supra- 

 frontal lobes well marked, the inner pair a little wider. 



Front four times as wide as high, widening beloAv, lower edge 

 sinuous, somewhat four-lobed in dorsal view. Outer orbital angle 

 acute. 



Chelipeds heavy. Only the lower edge of the merus has a sub- 

 distal notch, upper edge sharp, inner edge irregularly dentate, with 

 a triangular laminar expansion on the distal half. Inner angle of 

 wrist rounded. Palm nearly twice 



as high as its superior length. 1) {\ ^ x 



The outer surface is covered with /^v — %N ; ] 



the same scabrous granules that 

 form short transverse lines on arm 



and wrist; near the upper margin , ., ,. , , 



the granules are arranged in ob- / \ / 



lique parallel lines, but without '^ ^ ' ^ ' 



forming the strong ridges which 



characterize the subgenus Parase- 



sarma; inner face coarsely granu- a h 



lous with a short prominent ridge ^'«- i49. — sesarma (holometopds) 



^ CINEUEDM, MALE (15072). a, ABDO- 



near the distal end. Pollex elon- men, x zi ; b. right appendage of 



gate-triangular ; dactylus thickened ^^^-^"^ segment of abdomen, ven- 



at base and somewhat dorsally ilat- 



tened, a well marked concavity below at base. The fingers gape nar- 

 rowly, and the largest tooth of their applied edges is at the middle 

 of the pollex. 



Legs rather narrow, a sharp spine near the end of the merus; 

 third pair over twice as long as carapace, its merus a little more than 

 two and one-half times as long as wide. 



Abdomen of male broadlj'^ triangular; the appendages of the first 

 segment are hairy on the outer side of their extremities. 



Measure^nents. — Male (15072), length of carapace 17.5, width of 

 same 19.7, width of front above 11 mm. 



Habits. — Lives under logs, drift, and roots, on wharves and piling. 

 Found on muddy and sandy shores, near salt or brackish water, some- 

 times in mangrove swamps. In some situations makes burrows. 

 Mr. J. D. Mitchell saj^s of them: "They will go on board coasting 

 boats and make trips of several days or a week, hiding under ropes 

 or anywhere out of sight or reach. They prowl and feed mostly at 



