THE GRAPSOID CEABS OF AMERICA. 301 



Diagnosis, Transverse, nearly smooth. Front much more than 

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

 half times as long as wide. 



Description. Carapace distinctly transverse, of nearly 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 below, 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. 

 The outer surface is covered with 

 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 b 



Ions with a short prominent ridge Fl - "9. SESARMA (HOLOMETOPUS) 



c CINEUEUM, MALE (15072). C, ABDO- 



near the distal ejld. Follex elon- MEN , x 3$; l>, RIGHT APPENDAGE OF 



gate-triangular; dactylus thickened FIRST SEGMENT OF ABDOMEN, VEN- 



to TEAL VIEW, X 7}. 



at base and somewhat dorsally flat- 

 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 broadly triangular; the appendages of the first 

 segment are hairy on the outer side of their extremities. 



Measurements. 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 says 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 



