156 ZOOLOGISCHE MEDEDEELINGEN — DEEL ITI. 


49, Sesarma (Holometopus) haematocheir (de Haan). 
1835. Grapsus (Pachysoma) haematocheir de Haan. Faun. Japon., Crust., 
p. 62, pl. 7 f. 4 — Japan. 
1853. Holometopus haematocheir H. Milne-Edwards. Ann. Se. nat., (3) t. 
20 p. 188 — Japan. 
1858. Holometopus haematocheir Stimpson, Proc. Ac. Nat. Se. Philadel- 
phia, 1858, p. 106 — Hongkong, Simoda and Ousima. 
1865. Holometopus haematocheir Heller. Crust. Reise , Novara’, p. 66 — 
Hongkong. 
1887. Sesarma haematocheir de Man Zool. Jahrb. Syst., Bd. 2 p. 642 — 
no new locality. 
1893. Sesarma haematocheir Birger. Zool. Jahrb. Syst., Bd. 7 p. 614, 
pl. 21 f. 8 — Yokohama and Hongkong. 
1894. Sesarma haematocheir Ortmann. Zool. Jahrb. Syst., Bd. 7 p. 717 — 
Japan, Loo-Choo Islands and Singapore. 
1907. Holometopus haematocheir Stimpson. Smithson. Inst. Miscell. Coll., 
v. 49 p. 137 — same localities as in 1858. 
Specimens in the Museum: 
90, 4 9, Japan, v. Siebold coll. (types of de Haan). 
1 6, 1 Q, Amoy (China), G. Schlegel coll. 
8 of (partly juv.), 3 QO, Kobe (Japan), v. Oordt vy. Lauwenrecht coll. 1906. 
This species, the type of the subgenus Holometopus, has been well 
figured by de Haan, but after him it is only Biirger who gave some 
more information about it. It is easily recognizable by its front being 
perfectly straight and the postfrontal lobes being scarcely indicated, in- 
deed in such as way, that there is only a slight incision, separating the 
median lobes, while the lateral ones are not separated off. Now Biirger 
described and figured a variety, in which also the lateral lobes are in- 
dicated, and, though not so distinctly as figured by this author, I found 
the same among: my material. The whole surface of the carapace is 
perfectly smooth and polished, the regions scarcely indicated, only the 
cervical furrow '), between the gastric and cardiac region, being dis- 
tinct. The anterior thirds of the lateral margins of the carapace are a 
little diverging distally, the posterior two-thirds are parallel. The front 
is vertically deflexed and hollowed out, the nearly continuous line of 
the postfrontal lobes is sharp. In some specimens the posterior margin 
1) Birger always calls the groove separating the median postfrontal lobes the cervical 
furrow, against the usual denomination. 
