THE SPIDER CRABS OF AMERICA 353 



Description. — Carapace more elongate than T. puella, the gastro- 

 cardiac suture farther back, or halfway between posterior margin 

 of carapace and posterior margin of orbit. Lobules separated by 

 shallower depressions than in T. puella; protogastric and mesogastric 

 lobules each surmounted by a high, acute tubercle; cardiac lobule 

 with a similar but lower tubercle. Postero-lateral angle with a short 

 spine; above and anterior to the spine, a sharp tubercle; another 

 tubercle on each side of the middle near the posterior margin; and 

 in front of these last still another tubercle on the branchial region. 

 Rostral horns curving slightly inward and separated by a large 

 V-shaped sinus. Basal antennal joint narrower than in other species 

 of the genus, considerably longer than broad and armed distally with 

 two spines, outer one above inner, both visible in a dorsal view; 

 outer margin concave, a longitudinal crest at outer third; both 

 crest and margin finely crenulate. Cheliped of male (perhaps not 

 fully developed) rather feeble. The arm, wrist, and proximal fourth 

 of palm are finely granulate; the arm has sharp granulated margins. 

 The greater part of the palm is smooth and shining; three times as 

 long as wide; the fingers gape slightly for two-thirds their length 

 and are finely denticulate. Crests of merus joints of ambulatory legs 

 thin and of about equal width; the anterior crest has one or two 

 teeth, the posterior one has a rectangular distal prolongation. The 

 carpus joints have a triangular inner tooth and a narrow outer crest. 

 Surface sparingly pubescent; some longer hairs form lines on the 

 rostrum and in the depressions of carapace. 



Measvrements. — Male, holotype, length of carapace 10, width 8.2 

 mm. 



Range. — Porto Rico. 



Material examined. — Ensenada Honda, Culebra Island, Porto Rico; 

 February 9, 1899; Fish Haivk; 1 male, holotype, 1 female (23773). 



Genus PICROCEROIDES Miers 



Picroceroides Miers, Challenger Rept., ZooL, vol. 17, 1886, p. 77; type, P. 

 tubularis Miers. — Rathbun, Bull. U. S. Fish Comm., vol. 20, for 1900, 

 part 2 (1901), p. 76. 



Carapace narrow and rounded behind, constricted behind the 

 orbits, which are tubular and project laterally. The width at the 

 orbits equals or exceeds the greatest width at the branchial regions. 

 The orbits have a long preocular and a short postocular spine and are 

 emarginate above and below. Rostral horns long, slender, and 

 widely separated at base. Abdomen seven-jointed and transversely 

 ridged in both sexes; in the male the ridges correspond to similar 

 elevations on the sternum, which are rounded and separated by deep 

 depressions. Epistome transverse. Antennular fossettes small, deep, 

 and well defined. Basal joint of antenna considerably enlarged and 



