So 



Pacific, but afterwards ') also from Borneo and Malacca ; the author in his later paper expressed 

 the opinion, that this subspecies, characterized by slender and more elongate propodites of the 

 penultirrtate pair of legs, which are nearly 3 times as long (in the median line) as broad, in the 

 [ndo-Malayan waters most likely replaces the typical form of the Red Sea. 



On comparing the figures serving to illustrate the differences between the typical form s ) 

 and the subspecies s ) we indeed observe the slightly more elongate shape of the said propodites. 

 All the "Siboga" specimens belong to the subsp. of de Man. 



2. Metopograpsus thukuhar (Owen). 



1S39. Grapsus thukuhar Owen. Zool. capt. Beechey's Voy. "Blossom" p. 80, pi. 24, f. 3. 



1839. Grapsus par allelus Randall. Journ. Ac. Nat. Sc. Philadelphia, v. 8, p. 127. 



1852. Goniograpsus thukujar Dana. U.S. Expl. Exp., Crust., p. 344. 



1853. Metopograpsus thukuhar H. Milne-Edwards. Ann. Sc. Nat. (3) t. 20, p. 165. 

 1865. Metopograpsus thukuhar Heller. Reise "Novara", Crust., p. 43. 



1873. Metopograpsus thukuhar A. Milne-Edwards. Nouv. Arch. Mus. Paris, t. 9, p. 290. 



1880. Metopograpsus messor (part.) Kingsley. Proc. Acad. Nat. Sc. Philadelphia, 1880. p. 190. 



18S2. Goniograpsus thukujar Haswell. Cat. Austral. Crust., p. 99. 



1888. Metopograpsus thukuhar de Man. Arch. Naturgesch., Jahrg. 53, 1., p. 362, pi. 15, f. 5. 



1894. Metopograpsus messor var. thukuhar Ortmann. Zool. Jahrb., Syst., Bd 7, p. 702. 



1895. Metopograpsus thukuhar de Man. Zool. Jahrb., Syst., Bd 9, p. 76. 



1906. Metopograpsus messor (part.) Rathbun. Buil. U. S. Fish Comm. for 1903, v. 23, prt 2, p. 839. 



Stat. 50. Labuan Badjo, west coast of Flores. 1 c? juv. 



Stat. 142. Obi Major, south of Halmaheira. 1 cf • 



Stat. [81. Ambon. 1 9 J uv - 



Stat. 323. Bawean Island, Java Sea. 1 9 J uv - 



All the specimens, save one of medium size, are very minute and measure only a few 

 millimetres across the carapace. 



According to Ortmann this species does not live in the Indian Ocean, but only in the 

 Pacific; here it lives together with the genuine M. messor and may replace this species entirely 

 towards the eastern parts. lts occurrence in the Indo-Malayan Archipelago has been already 

 noted by de Man. Notwithstanding the careful researches of this author, who clearly separated 

 the two named species, on account of the more or less convergence of the lateral margins 

 of the carapace and the shape of the inner orbital lobe, Miss Rathbun seems to unite the 

 species altogether. 



3. Metopograpsus maculatus H. Milne-Edwards. 



Literature: ALCOCK, 1. c. p. 39S. Description : DE Man, Journ. Linn. Soc. Eondon, v. 22, 

 1888, p. 145, pi. 10, f. 1 — 3. 



Stat. 47. Bay of Bima, Sumbawa. I 9- 



1) Zool. Jahrb., Syst., Bd 9, 1895, p. 75: Notes Leiden Mus., v. 21, 1S99, p. 132. 



2) Arch. Naturgesch.. Jahrg. 53, 1., iSSS, pi. 15. f. 6. 



3) Notes etc, 1S91, pi. 4, f. 14. 



80 



