NO. 2135. NEW PHILIPPINE CRABH—RATHBUN. 543 



ence lies in the presence of the long (for Ilyastenus) spines of the 

 posterior carapace ; the related species also have no antennal spine. 



HYASTENUS AUCTUS, new species. 



Ty lie-locality. — Near Siasi, Siilu Archipelago: Sirim Island (N.), 

 S. 80° W., 3.8 miles; hit. 5° 35' 40" N.; long. 120° 47' 30" E. ; 17 

 fathoms; co. S.; Feb. 16, 1908; station 5148, Albatross. 



IIolofype.—Ma\e. Cat. No. 48214, U.S.N.M. 



Meas-m'emenf's. — Length on median line, 21 ; length of rostral 

 horns, 12.2 ; width of carapace without spines, 14 ; witlth with spines, 

 15.2. 



Gastric region very high, conical, rising to a subacute apex or 

 tubercle; cardiac region a little loss high, smoothly rounded; intes- 

 tinal region with a short, conical, subacute spine. A stout, pointed 

 spine at the branchial angle, directed outward, upward, and slightly 

 backward; a little above, in front of, and within this spine is an- 

 other, short, stout, tuberculiform, acute; on the anterior branchial 

 areola there is a lower, smaller, submarginal tubercle. On each 

 gastric region near the orbital sinus there is a large tubercle on each 

 side, the distance between which is very little greater than from either 

 to the median tubercle. A tubercle on margin of hepatic region. 

 Three pterygostomian tubercles. Rostral horns straight, regularly 

 tapering, divergent. Orbit and antennal joint much as in //. spinosus. 



Chelipeds very little longer than carapace, excluding rostrum; 

 palms not enlarged, fingers gaping very narrowly at base only. 

 Legs rather stout, spinules of dactyls small. 



Relatlo7isMps. — Near //. sphiosus, from which it differs in having 

 only one median tubercle on the gastric region, instead of two tu- 

 bercles or spines; and in having a supplementary tubercle or spine 

 above the posterior branchial spine. ALso has a curious resemblance 

 to II. hllgemlorfl'^ in its ornamentation, but the carapace is narrower 

 behind and wider across the orbits ; it lacks the two tubercles on the 

 subbranchial region, also has fewer gastric tubercles, while the gastric 

 region is more strongly humped. 



HYASTENUS TUBERCULOSUS, new species. 



Type-locality. — Near Jolo: Jolo Light, S. 17° E., 5.5 miles; lat. 

 6° 09' N.; long. 120° 58' E.; 29 fathoms; co. S.; Feb. 15, 1908; sta- 

 tion 5141, Alhatross. 



IIolotype.—M^\Q. Cat. No. 48215, U.S.N.M. 



Measurements. — Length on median line, 9.2; length of horn, 3.6; 

 width of carapace, 6. 



Carapace with four median tubercles, two large gastric, the pos- 

 terior of which is at the highest point of the carapace, one cardiac 

 and one intestinal; four additional tubercles on the gastric region, 



1 De Man, Jour. Linn. Soc. London, Zool., vol. 22, 1887, p. 14, pi. 1, flgs. 3, 4. 



