1900.] A. Alcock — Garcinological Fauna of India. 395 



angle of the orbit is not so completely isolated. The antennal peduncle 

 is not so massive, nor is its " urinary tubercle " conspicuous. The 

 epistome is shorter fore and aft, and is much less well defined. 



The chelipeds are altogether of a different type, being vastly more 

 massive than the legs, and in the adult male at least as loug as the 

 longest legs : the fingers are pointed. Though the dactyli of the legs 

 are thorny, they are not so closely covered with thorns, nor are the 

 thorns so coarse, as in Grapsus. Between the coxaa of the 2nd and 3rd 

 pair of legs is a narrow fossa fringed with hair leading to the branchial 

 cavity. 



The two Indian species of the genus are land-crabs and are found 

 in the jungles of the Andaman and Nicobar islands and in the villages 

 of the Laccadive islands. They are extremely vigilant and active. 



84. Geograpsus Grayi (Edw.). 



Grapsus Grayi, Milne Edwards, Ann. Sci. Nat. Zool. (3) XX. 1853, p. 170. 



Geograpsus rubidus, Stimpson, Proc. Ac. Nat. Sci. Philad. 1858, p. 103. 



Geograpsus Grayi, A. Milne Edwards, Nonv. Archiv. du Mus. IX. 1873, p. 288 : 

 Miers, Phil. Trans. 1879, p. 489, and Zool. H. M. S. Alert, pp. 518, 545, and Chal- 

 lenger Brachyura, p. 261 : Kingsley, Proc. Ac. Nat. Sci. Philad. 1880, p. 196 : 

 Kichters, in Mobius, Meeresf. Maurit. p. 156 : Haswell, Cat. Austral. Crust, p. 98: 

 Ortmann, Zool. Jahrb., Syst., VII. 1893-94, p. 707 : de Man, Zool. Jahrb., Syst. IX. 

 1895-96, p. 80 : Nobili, Ann. Mus. Genov. (2) XX. 1899, p. 266. 



Carapace subquadrilateral, a little convex, the lateral borders well 

 defined anteriorly, ill defined and slightly convergent posteriorly : 

 transverse markings fine, curved or oblique on the branchial regions, 

 almost invisible on the gastric region. 



The four tubercles along the line of flexion of the front are not 

 salient ; the edge of the front in a dorsal view is concave. The notch 

 near the outer end of the lower border of the orbit is small and narrow. 

 The epistome is rather ill defined. 



Chelipeds in both sexes a little unequal : squamiform markings 

 are present but, except on the arm, are indistinct, as also are the scat- 

 tered granules on the upper surface of the palm. The larger cheliped 

 may be a little under or a little over twice the length of the carapace. 

 The inner border of the ischium is denticulate, the inner border of the 

 arm is expanded to form a dentate lobe, and the inuer angle of the 

 wrist is spiniforro. 



The greatest breadth of the meropodites of the legs is less than 

 half their length. The first pair of legs are slightly shorter than the 

 4th : the 2nd pair are the longest of all, being about twice the length 

 of the carapace. The last 3 joints of all the legs are bristly. 



