THE GRAPSOID CRABS OF AMERICA. 



307 



Salinas de Caldera, Boca del Jesus Maria; on mangroves; 

 Jan., 1906; 1 male, 1 female (male is holotype) (32490) ; 1 female 

 (32316). Apr., 1905; 1 male (32317). 



SESARMA (HOLOMETOPUS) TAMPICENSE Rathbun. 



Plate 88. 



Sesarma (Holometopus) tampicense RATHBUN, Proc. U. S. Nat. Mus., vol. 

 47. 1914, p. 124, pi. 8. text-fig. 4 (type-locality, Tampico, Mexico; 

 holotype male, Cat. No. 45794, U.S.N.M.). 



Diagnosis. Sides of front parallel. Palm finely granulate. Fin- 

 gers gaping. Merus joints of legs converging slightly from middle 

 to distal end. 



Description. Carapace perceptibly wider than long, of nearly 

 even width throughout, though widening slightly behind. Surface 

 coarsely punctate at the middle, finely punctate on 

 the branchial and intestinal regions, the punctae 

 more or less connected by fine grooves; surface of 

 frontal region and antero-lateral angles finely 

 granulate; postero-lateral grooves fine. 



Supra-frontal lobes deeply separated, the me- 

 dian groove larger than the lateral grooves : mid- 

 dle pair of lobes transversely arcuate: outer pair 

 narrower, oblique, trending forward toward the 

 orbit. Front relatively broad and low, about 

 five times as wide as high, sides vertical, lower 

 margin arcuate in front view, sinuous in dorsal 

 view, surface concave in both directions. Up- 

 FIG. 151. SESARMA p er mar orin o f orbit nearlv straight, up to the 



(HOLOMETOPCS) * => ' * 



TAMPICENSE, LEFT short, acute tooth at the outer angle of the orbit. 

 APPENDAGE OF Merus of cheliped covered with granulated 



FIRST SEGMENT OF . . 



ABDOMEN OF MALE rugae on its outer face; lower outer margin with 

 HOLOTYPE, VENTRAL a W ell-marked subdistal tooth; tooth on upper 



VIEW X 8 



margin nearly obsolete ; inner margin denticulate, 

 distally expanded and bearing a large tooth. Upper surface of carpus 

 similar to outer surface of merus. Palm massive in the full-grown 

 male, as high as its horizontal length, lower margin arcuate, upper 

 margin marked by interrupted lines of granules; outer surface cov- 

 ered with fine, depressed granules, inner surface with much larger 

 granules on the more elevated portion. Fingers rather long and 

 slender, for the genus, gaping in the male except at the tip: pre- 

 hensile edges dentate, with two or three teeth enlarged on each finger. 

 Legs of moderate length, the third pair about twice as long as 

 the carapace; merus joints about two and three-fourths times as long 

 as wide, converging slightly from the middle to the distal end. 



