THE SPIDER CRABS OF AMERICA 363 



Othonia aculeate Stimpson, Bull. Mus. Comp. ZooL, vol. 2, 1871, p. 116 



(part). — KiNGSLEY, Proc. Acad. Nat. Sci. Philadelphia, 1879 (1880), 



p. 388 (part). — A. Milne Edwards, Bull. Mus. Comp. Zool., vol. 8, 1880, 



p. 2. 

 OiAoniacaroKncnsis Rathbun, Proc. U. S. Nat. Mus., vol. 15,1892, p. 256, pi. 



35, figs. 1 and 2 (type-locality, off Charleston, South Carolina; holotype. 



Cat. No. 3158, U.s'.N.M.). 

 Pitho Ihenninieri Ratiibun, Ann. Inst. Jamaica, vol. 1, 1897, p. 8; Bull. 



U. S. Fish Comm., vol. 20, for 1900, pt. 2, 1901, p. 78. 

 Pitho aculeata A. Milne Edwards and Bouvier, Mem. Mus. Comp. 



Zool., vol. 47, 1923, p. 395. 



. Diagnosis. — First movable segment of antenna narrow. Manus 

 broad, compressed. Fourth and fifth lateral teeth much reduced in 

 females and young males, rudimentary in old males: second and 

 third teeth united at base. 



Description. — Carapace rough with tubercles of different sizes, as 

 broad as long in the adult male, longer than broad in other forms, 

 very narrow behind in males, much wider in females. Fronto- 

 orbital width about half the entire width in adults, greater in the 

 young. Frontal teeth slightly more advanced than orbital angles. 

 Second and third lateral teeth subequal; fourth and fifth much re- 

 duced. First movable article of antenna similar to that of P. aniso- 

 don, but wider (fig. 117, h). 



Chelipeds similar to those of P. aculeata. Appendages of abdomen 

 of male in contact at about three-fifths the distance from distal end, 

 then separating slightly in faint curves concave to each other, 

 and again converging before they finally spread out at tips; distal 

 three-fifths yellow, very slender, tapering gradually to a fine point 

 (fig. 116, a). "^ 



Variation. — In the females and young males, the carapace is more 

 tuberculate than in the old males, the lateral teeth are sharper, the 

 fourth and fifth teeth being more prominent than in the males. 



The Cuban male (48733) approaches P. mirabilis in having a 

 shorter and broader carapace than in typical Iherminieri; the usual 

 pattern ol tubercles and coarse granules is set in a background of 

 very fine granules, finer than those of mirahilis; the transverse row 

 of transverse tubercles above the posterior margin is almost indis- 

 tinguishable. 



CoZor.— Dirty brownish yellow (Desbonne). 



Measurements. — Male (51003), length of carapace to tips of ros- 

 tral teeth 15.4, width of carapace 14.6 mm. Female (19357), length 

 of carapace 18.2, width of same 16.5 mm. Male (Paris Mus.), 

 length and width each 25 mm. 



Range. — From Beaufort, North Carolina, to Sao Paulo, Brazil. 



Material examined. — See table, pages 364-365. 



