THE GRAPSOID CRABS OF AMERICA. 287 



ANALOGOUS SPECIES ON OPPOSITE SIDES OF THE CONTINENT. 



Atlantic. rnciflc. 



ret icnlu turn, avqiuitnrinJc. 



cnracnoense. rhizophonic. 



cincrcuiii. occiileiitulc. 



micrsii ihcringi. hioUcyi. 



roberti. angvsium. 



Species on both sides of the continent: angustipes. 

 Si)ecies indeterminable: suhintegra White (List Crust. Brit. Mus., 

 1847, p. 38), Brazil, nomen nudum. 



Subgenus Chiromantes Gistel (=Perisesarma de Man). 



Carapace with a lateral tooth behind the outer orbital tooth. 

 Manus with oblique, coarsely pectinated ridges on upper surface. 



SESARMA (CHIROMANTES) AFRICANUM Milne Edwards. 



Plate 75. 



Sesarma africana Milne Edwards, Hist. Nat. Crust., vol. 2, 1S37, p. 73 

 (type-locality, Senegal; type in Paris Mus.); Ann. Sci. Nat., ser. 3, 

 Zool., vol. 20, 1853, p. 185 [151]. 



Sesarma {Periscsarma) africanum Rathbun, Proc. U. S. Nat. Mus., vol. 22, 

 1900, p. 280. 



Diagnosis. — Large, hairy. Transverse ridge inside hand. Menis 

 joints of legs about two and one-half times as long as wide. 



Description. — Carapace five-sixths as long as wide, a little nar- 

 rowed at the anterior angles; the four post-frontal lobes prominent, 

 the middle pair wider than the outer pair; surface uneven, crossed 

 by short thick ridges of hair. Lateral tooth strong; behind it, a 

 faint indication of another tooth. 



Front vertical, concave, its greatest height nearly one-fourth its 

 greatest width, loAver edge very sinuous, sides subparallel, corners 

 prominent and rounded. 



Chelipeds in the male much more massive and in the female slightly 

 more massive than the legs. Outer surface of arm and wrist crossed 

 by granulated striae, outer surface of hand coarsely tuberculate. 

 Arm with a sharp subterminal tooth above, and a row of stout teeth 

 on the lower margins. Inner border of arm with a few inconspicuous 

 denticles. Upper surface of palm with about four oblique, subparal- 

 lel granulated ridges; inner face tubercidate, the upper half with 

 a very prominent ridge, coarsely tuberculate. Palm of male much 

 enlarged, wider than its length at middle. Dactylus less than twice 

 the length of the upper border of the palm; its dorsal surface is 

 crossed by about fifteen oblique, blunt ridges each of which is crossed 

 by fine impressed lines. Fingers broad and flat, moderately gaping, 

 each with two enlarged teeth. In the female the palm is much less 



