igO BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



Description. — Male: Carapace with a narrow, produced front, 

 giving the appearance of greater carapace length than width, exclu- 

 sive of spine. Surface finely granulate, granules separated, those in 

 the middle third depressed in pits. Posterior median spine about 

 one and one-half times as long as lateral spines. Hepatic region with 

 rudimentary tooth. Pterygostomian border rounded, not angular, 

 farther back than in liodadylus and much less prominent. The last 

 two segments of the abdomen have straight sides which steadily 

 converge to a narrow, rounded point. Chelipeds twice as long as 

 carapace and much less slender than in the allied species. 



Color. — Reddish brown with a row of three light dots on either side 

 of middle, forming an arch from the anterior corners of the cardiac 

 region and continued diagonally forward along the cervical groove. 



Measurements. — Type male, length of carapace without posterior 

 spine 23.4, width 20.6 mm. 



Range. — Lower California, Mexico, to Colombia; 10 to 40 fathoms. 



Material examined. — See table 61, page 191. 



ILIACANTHA SPARSA Stlmpson 



Plate 56, Figures 1, 2 



Iliacantha sparsa Stimpson, Bull. Mus. Comp. Zool., vol. 2, p. 156, 1871 (type 

 locality, West of Tortugas, 30 fathoms; type not extant). 



Diagnosis. — A spine on subhepatic margin. Fingers and palm of 

 subequal length. Carapace sparsely covered with coarse granules. 



Description. — Carapace longer than broad; posterior margin un- 

 usually broad, its spines widely separated and divergent. All three 

 posterior spines triangular, tips upturned, the median one somewhat 

 longer. Dorsal surface sprinkled with large, upstanding granules on 

 a base of smaller, depressed granules. A broad, prominent spine on 

 hepatic region. Depression between frontal and gastric regions very 

 deep, giving great prominence to the facial projection. Median sinus 

 of front very deep, frontal teeth much projecting. Outer maxillipeds 

 large and coarsely granulated. Remainder of lower surface paved 

 with flat granules. Palms slender, gradually tapering; fingers and 

 palm of subequal length. 



Measurements. — Male (11020), length including spine 19.2, width 

 14.7 mm. 



Range. — Gulf of Mexico to Barbados; 30 to 40 fathoms. 



Material examined. — See table 62, p. 191. 



