130 BULLETIN 129,, UNITED STATES NATIONAL MUSEUM 



larly to the tip. Manus of male cheliped subglobular. No spine 

 near proximal end of merus of ambulatory leg. 



Description. — Adult male: Regions of carapace well marked, tumid, 

 rough with granules, sharp tubercles, and spines. Six of the larger 

 spines are median (2 mesogastric, 1 urogastric, 2 cardiac, 1 intestinal), 

 one is protogastric, two or three are hepatic, and the remainder branch- 

 ial, as follows: Four (or five) marginal and seven or eight scattered 

 on dorsal surface. Of the median spines, the anterior cardiac and 

 posterior mesogastric are the longest. The granules which cover the 

 surface are not close together and are irregular in size. In the de- 

 pressions separating the branchial from the cardiac, gastric and 

 hepatic regions, there are several deep pits. Rostrum simple, be- 

 tween one-fourth and one-fifth the postrostral length of carapace, 

 narrow, inclined upward, trigonal, acute, its upper and lateral mar- 

 gins spinulous. There is an acute, triangular, interantennular spine, 

 pointing downward and slightly fonvard. Supraorbital spine al- 

 most erect, directed slightly outward and forward. Anterior margin 

 of postorbital tooth, both above and below, fringed with hair. 



Basal article of antenna with a terminal spine, a large spine at 

 middle of inner margin, and a small spine at middle of outer margin 

 followed by a row of tubercles or spinules. A single row of spinules 

 and one spine on pterygostomian region, a tubercle at angle of buccal 

 cavity. Outer maxillipeds spinulous ; a longitudinal median depres- 

 sion on ischium. Chelipeds and ambulatory legs covered with a 

 short fur, underneath which the surface is rough with sharp granules 

 or spinules. Margins of merus of cheliped armed with short spines, 

 terminal spine of upper margin longer; upper margin of carpus 

 spinulous, a few larger spines on outer surface; propodus much in- 

 flated, subglobular; dactylus as long as the upper margin of propodus; 

 both fingers bare and w^ith two longitudinal sulci on the outer side; 

 prehensile margins evenly dentate and in contact to near the base, 

 where they are denticulate and gape slightly. Ambulatory legs 

 spinulous; merus with an acute oblique spine at distal end. First 

 abdominal segment long, bearing an acute spine pointing backward. 

 Sternum oblique; anterior portion strongly retreating. 



Adult female: Chelipeds and legs almost bare. Chelipeds not 

 much stouter than ambulatory legs, dactylus one and a half times as 

 long as the small palm. Legs shorter than in male. 



Young: Pubescence slight, as in female. Postorbital tooth less ex- 

 tensive, tip directed obliquely outward and forward; in very small 

 specimens, about 7.5 mm. long, the postorbital tooth is slender and 

 projects directly outward. 



Measurements. — Male (46778), length of carapace 40.7, width 32.3 

 mm. 



