THE SPIDER CBABS OF AMERICA 375 



Ensenada Honda, Culebra Island, Porto Rico; February 10, 1899; 

 Fish Hawlc; 1 female, holotype (24205). 



RemarJcs. — ^The specimen from Wreck Bay, St. Thomas, figured by 

 Aurivillius has only four lateral teeth, but the first one is represented 

 as similar to, and larger than, the two succeeding teeth. This throws 

 doubt on the identity of his species and ours. 



Genus LEPTOPISA Stimpson 



Leptopisa Stimpson, Bull. Mus. Comp. ZooL, vol. 2, 1871, p. 114; type, 

 L. setirostris (Stimpson). — Rathbun, Bull. U. S. Fish Comm., vol. 20, 

 for 1900, pt. 2 (1901), p. 75. 



Leptopisa (subgenus of Tiarinia). A. Milne Edwards, Crust. R6g. Mex., 

 1875, p. 63. 



Carapace narrow, oblong, tuberculated, with an epibranchial spine, 

 but no lateral series of spines. Orbits complete, short, tubular. 

 Spines of rostrum long and slender. Basal joint of antenna enlarged, 

 armed with spines distally; movable part of antennae very slender 

 and partly hidden by rostrum. Buccal cavity very wide; merus of 

 outer maxillipeds strongly dilated laterally, wider than ischium and 

 notched at inner angle. Chelipeds slender, elongate. Ambulatory 

 legs decreasing regularly in length, the first pair very long, last pair 

 very short. 



Closely allied to Macrocoeloma, from which it differs chiefly in its 

 narrow carapace, long horns, and short orbital tubes. 



Contains only the type species. 



LEPTOPISA SETIROSTRIS (Stimpson) 



Plate 134, figs. 1-3; plate 253, fig. 2 



Tiarinia setirostris Stimpson, Bull. Mus. Comp. ZooL, vol. 2, 1871, p. 114 



(type-localities, Key West, 2 to 5 fathoms; near the Tortugas, 9 fathoms; 



on the Fishing Banks, SW. of Loggerhead Key; types destroyed in the 



Chicago fire). 

 Leptopisa setirostris Stimpson, Bull. Mus. Comp. ZooL, vol. 2, 1871, p. 114, 



in text.— Rathbun, Bull. U. S. Fish Comm., vol. 20, for 1900, pt. 2, 



1901, p. 75. 

 Leptopisa (subgenus of Tiarinia) setirostris A. Milne Edwards, Crust. 



R6g. Mex., 1875, p. 64. 

 Macrocoeloma tenuirostra Rathbun, Proc. U. S. Nat. Mus., vol. 15, 1892, 



p. 252, pi. 33, fig. 1 (type-locality, between Jamaica and Haiti, 23 fathoms, 



station 2138, Albatross; type, Cat. No. 6929, U.S.N.M.). 



Diagnosis. — Sides of carapace perpendicular; dorsum tuberculate. 

 Rostral horns long, slender, contiguous. 



Description. — -Carapace covered with a short pubescence, and 

 numerous depressed tubercles; cardiac region with a prominent 

 tubercle; mesogastric region with one less high; intestinal region 

 with two short median spines; a short, sharp spine at postero-lateral 

 angle of branchial region; lateral margins nearly straight, tuberculate; 



