THE SPIDER CRABS OF AMERICA 151 



EPIALTUS LONGIROSTRIS Stimpson 



Epialtus lojigirostris Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 

 1860, p. 199 (type-localitj-, St. Thomas; cotype in Paris Mus.); Bull. 

 Mus. Comp. ZooL, vol. 2, 1871, p. 128. — A. Milne Edwards, Crust. 

 R4g. Mex., 1878, p. 141, pi. 27, figs. 5-5c.— Kingsley, Proc. Acad. Nat 

 Sci. Philadelphia, 1879, p. 385. 



Diagnosis. — Rostrum very narrow, truncate. Sides of carapace 

 deepl}^ bilobed. Arm cylindrical, hand long and narrow, fingers 

 thick. 



Description. — Postgastric and cardiac regions rather prominent. 

 Carapace nearly as wide across hepatic as across branchial regions. 

 Lateral sinus much deeper than in the three preceding species and 

 deeper in male than in female. Hepatic lobe a little larger than 

 branchial lobe, both acute. The two gastric tubercles are distinct. 

 Preorbital angle strong, sharp; from it the rostrum rapidly narrows 



to a long, slender beak, which is 

 rather thick, truncated at extremity, 

 the anterior surface rectangular, 

 about twice as wide as high. Post- 

 orbital tooth obscure, not projecting; 

 a tubercle on anterior margin of 

 hepatic lobe. (Fig. 53, » 



Chelipeds without sharp margins; 

 merus cylindrical; carpus with large 

 tubercle on outer surface; palm elon- 

 FIG.56.-EPIALTCS LONGIROSTRIS, MALE gatc, Uttlc comprcsscd, culargiug 

 (48742), LEFT cHELiPED. THE CARAPACE IS slightly toward dlstal end; fingers 



ABOUT 7.5 MM. LONG , " , , i j^ i . 1 



short and very stout, bent down, a 

 small oval gape at base in male. Ambulatory legs slender, without 

 tufts of hair on propodites except a slight one on first pair. 



Measurements. — Male (48742), length (tip of rostrum lacking) 

 7.5, width 5.5 mm. Female (43019), length 7, width 4.8 mm. 



Rang e.^b'lorida, (Sarasota Bay and Key West), Cuba, Jamaica 

 and St. Thomas. 



Material examined. — 



On reef Lavesos Italienos, opposite Cayo Lavesos, Cuba; 2 to 3 

 fathoms; Co. S. R.; station 14, Tomas Barrera Exped.; Henderson 

 and Bartsch; 1 male (48742). 



Jamaica; 1910; E. A. Andrews; 1 female (43019). 



EPIALTUS LONGIROSTRIS forma PORTORICENSIS Rathbun 



Epialtus longirostris forma portoricensis Rathbun, Proc. Biol. Soc. Washing- 

 ton, vol. 36, 1923, p. 72 (type-locality, Ensenada Honda, Culebra Island; 

 holotype, Cat. No. 24154, U.S.N.M.). 



Diagnosis. — Differs from typical longirostris only in the rostrum 

 being slightly wider and less thick, and the tip slightly arcuate in 

 dorsal view. 



