78 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.47. 



SESARMA (SESARMA) TECTUM, new species. 



Type-locality.— Port San Vicente, Palaui Island, ojff northern Luzon; 

 seine; Nov. 14, 1908; 1 female adult. 



Type.— C&t. No. 45766, U.S.N.M. 



Dimensions. — Type female, length 18.3 mm., width at antero- 

 lateral angles 18.4 mm., greatest width (at middle of carapace) 20.2 

 mm., width of front 12 mm., height of front 3.7 mm., length of pro- 

 podus of cheliped 9.2 mm,, height of same 4.8 mm., superior length 

 of palm 3.6 mm., length of merus of third leg 14.3 mm., width of same 

 5.3 mm. 



This crab is densely covered with pubescence everywhere except 

 on the cornese, the terminal half of the fingers and the horny tips of 

 the legs; tufts of longer hairs are disposed on carapace, chelipeds, 

 and legs, including a tuft on each tubercle. 



Carapace almost square, except for the two lobiform teeth which 

 project laterally beyond the orbital tooth and make the carapace 

 wider at those points. Regions limited by wide grooves. The prin- 

 cipal tubercles are as follows: One large, behind each frontal lobe, 

 the middle pan further back than the outer pair; one in the middle 

 of the mesogastric region, and one on each side and nearly in the same 

 line on the protogastric region; two side by side on the cardiac region; 

 about three on each branchial region. Before the hairy coat is removed 

 the tubercles seem to be more numerous. The surface is in the main 

 smooth and shining, and there are no oblique ridges on the postero- 

 lateral regions. Frontal lobes promment and deeply separated, the 

 outer a little narrower than the inner. The front widens from above 

 downward, is lowest at the outer ends and most prominent along the 

 lower margin; this last is convex in front view, but sinuous from 

 above, showing six shallow prominences; surface of front uneven. 

 Upper margin of orbit very oblique; orbital tooth very slightly 

 advanced, outer margin convex. 



Chelipeds of female equal, of moderate size. Merus with a subter- 

 mmal tooth on upper margin, and a slight prominence but no tooth 

 on the inner margin. Outer surface of carpus covered with low tuber- 

 cles; inner angle blunt. Chelae, when hair is removed, smooth and 

 shining, without ornamentation in the way of granules or lines but 

 with two or three depressed and mconspicuous tubercles on upper 

 surface, and fine punctas in a reticulating pattern where the haii-s 

 are inserted; upper margin of palm blimt; lower margin of propodus 

 nearly straight; fingers slender, prehensile edges finely toothed as 

 far as to the horny extremities which occupy the distal third and are 

 slightly notched where the tips cross each other. Merus joints 

 of the legs bordered by irregular tufts of hair which have the 

 appearance of lobes; a subterminal tooth on anterior margin; 

 the tufts of hair on the upper surface of merus, carpus, and propodus 



