NO. 2135. NEW PHILIPPINE CRABS— RATHBUN. 555 



LEPTOMITHRAX SINENSIS, new species. 



Type-locality. — China Sea, near southern Luzon: lat. 21° 33' N. ; 

 long. 116° 15' E.; 88 fathoms; crs. S. Sh.; Nov. 4, 1908; station 5311, 

 Albatross. 



Ilolotype. — A dried specimen, sex unknown, showing only the 

 carapace with basal antennal segments and epistome attached. Cat. 

 No. 48219, U.S.N.M. 



Measurements. — Length of carapace on median line, 32; \yidth of 

 carapace without spines, 25.3; length of rostrum exclusive of point 

 broken off, 5.7. 



Carapace oblong-ovate, convex ; regions well marked, covered with 

 irregular tubercles and granules except on the horns, the sides of 

 the gastric region, and some of the interregional furrows, where it 

 is nearly smooth. The projecting hepatic region is armed with 

 two short spines, the posterior one smaller; branchial regions with 

 four strong marginal spines, the posterior of which is well up on 

 the dorsal surface ; two short triangular spines on the posterior 

 margin; three sizable median tubercles, two gastiic, one genital; 

 the principal submedian, paired tubercles are, three between orbits, 

 diminishing anteriorly; two gastric, in front of large, anterior, 

 median tubercle, the anterior pair nearer together; one large, meso- 

 gastric; one at summit of cardiac region and one on posterior 

 slope; two small, intestinal. Rostral horns slightly curved (con- 

 cave outside), acute, about twice as long as basal width. Supra- 

 orbital hood rather closely granulate, broad, and with a small 

 postero-external tooth or lobe, the tip of which is broken off; next 

 sinus narrow ; intermediate tooth long, triangular, acute, granulate ; 

 next sinus like a buttonhole, being closed anteriorly; postocular 

 cup produced obliquely forward, outward and slightly upward, 

 ending in a narrow, truncate spine. Interantennular spine curved 

 forward, blunt-pointed. Basal antennal segment wide, nearly 

 smooth, with two distal spines and an outer marginal lobe; the 

 inner distal spine is dentiform, compressed in an oblique plane, 

 thick, curved, the tip reaching a little further forward than the inter- 

 antennular spine, the inferior or convex margin crenulate; the outer 

 distal spine is gradually tapering, acuminate, produced outward 

 more than forward and granulate above. The subhepatic region is 

 swollen, tuberculate, and granulate ; the sul)branchial region is simi- 

 larly roughened ; a conical elevation on the pterygostomian region. 



Relationships. — This species is very close to L. edioardsii^ in shape 

 and ornamentation, but the postocular cup of edwardsii is directed 

 straight forward and is sharply acute at tip, and the basal antennal 



^ Maja ( Paramithrax) Peronii de Haan (not Milne Edwards), Fauna Japon., Crust., 

 pi. L'l, flgs. 2, 2a, 21). Maja (Paramithrax) edwardsii de Haan, same reference, 1S.">9, 

 p. 92, pi. G. 



