

BATHBUN: DECAPOD CRUSTACEANS. 307 



Macrophthalmus pacificus Dana. 



Plate 1, fig. 3. 

 Macrophthalmus pacificus de Man, Notes Ley den Mus., 1890, 12, p. 79, pi. 4, fig. 10, 



Moluccas: Amboyua; 2 J 2 9 1 juv. The "two minutely granulated, pu- 

 bescent, longitudinal lines," described by de Man as running parallel with each 

 other not far from the postero-lateral margins, are scarcely distinguishable in 

 these specimens. The central part of the carapace is smooth (non-granulate). 

 The arcuate edge of the front has a tendency to bilobe. 



Macrophthalmus definitus Adams and White. 



Plate 2, fig. 1. 

 Macrophthalmus definitus Ortmann, Zool. Jahrb. Syst., 1897, 10, p. 342. 



Celebes: Makassar; 19- Compared with specimens from the Philippines in 

 the Museum of the Academy of Natural Sciences of Philadelphia, 1 and determined 

 by Dr. Ortmann (loc. cit.). 



The general aspect is much the same as in M. japonicus, 11 but the following dif- 

 ferences are observed : The carapace is decidedly narrower in definitus, its length 

 f of its greatest width (ja. japonicus, length about § greatest width) ; a'granulatcd 

 line several granules in width and concave forward, on each epigastric lobe; the 

 smooth areas of the dorsal surface are well defined, that on the gastric region has 

 somewhat the form of a clover leaf, those on the hepatic region and at the antero- 

 intemal angle of the branchial region are subtriangular ; that on the cardiac and 

 intestinal regions is mushroom-shaped; the front between the eyes is less con- 

 stricted or hourglass-shaped. 



The cheliped of the male is considerably larger in M. definitus, specimens of a 

 size compared. The lower surface of the arm is devoid of the thick mat of long 

 hair that exists in M. japonicus ; the outer surface of the palm is rolled over in- 

 ward at its proximal end more strongly ; upper edge of the palm blunt and coarsely 

 granulate, with no line of single granules (in japonicus there are two rather well- 

 defined lines of granules, those of the inner line larger and sharper than those of 

 the outer; also on the inner surface a little below the upper edge, an incomplete 

 line of granules coarser than the others on the inner surface) ; the greater part 

 of the inner surface of the palm as well as the inner surface of the fingers is cov- 

 ered with long hair. In both species there is a squarish, truncate tooth near the 

 base of the dactyl, but it is very much smaller in M. definitus ; the low, oblique 

 tooth on the immovable finger is situated near its middle in definitus, but is not 

 far from the proximal end in japonicus, so that the teeth of the opposing fin- 

 gers strike each other mjapo?iicus, but are widely separated in definitus. Cheli- 

 peds of female similar in the two species. Legs narrower in definitus, merus joints 



1 Through the kindness of Mr. Witmer Stone. 



2 De Haan, Fauna Japon., 1835, p. 54, pi. 7, fig. 1(9), pi. 15, fig. 2 ( $ ). 



