THE SPIDER CRABS OF AMERICA 351 



THOE PANAMENSIS Nobili 



Plate 125, figs. 5 and 6 



Thoe erosa A. Milne Edwards, Crust. R6g. Mex., 1875, pi. 19, figs. 4-4d; 



1878, p. 121 (not synonymy). — Rathbun, Mem. Mus. Comp. Zool., 



vol. 35, 1907, p. 74 (not all synonymy) . Not T. erosa Bell, 1836. 

 Thoe panamensis Nobili, Boll. Mus. Zool. Anat. Comp. R. Univ. Torino, 



vol. 16, No. 415, 1901, p. 30 (type-locality, Isola Flamenco, Bay of Panama; 



tj^pe in Mus. Turin). — Rathbun, Proc. U. S. Nat. Mus., vol. 38, 1910, 



pp. 575 and 618; the locality "Ecuador" is an error. 



Diagnosis. — -Very near T. sulcata. Outer row of excavations on 

 arm obsolete or obsolescent. Merus of ambulatory legs entire or 

 obscurely spinulous above. 



Description. — Panama specimens differ from more northern ones 

 in the above characters chiefly. However, the obsolescence of the 

 outer row of excavations on the arm is not altogether constant. 

 The old male in panamensis has widely gaping lingers, as in sulcata, 

 but the tooth on the dactyl at the middle of the gape is broader than 

 long, its edge tridentate or tricrenulate. On the merus of the legs 

 no spines or spinules show among the marginal hairs, nor is there a 

 spine on the posterior surface near its proximal end. 



Perhaps not specifically distinct from sulcata. 



Measurements. — Male (48786), length of carapace 

 13.7, wddth of same 12.3 mm. 



Range.— Bay of Panama. 



Material examined. — 



Taboguilla Island; between tide-marks; October 31, 

 1899; Alhatross; I male (7072, M. C. Z.). 



Taboga Island; June, 1914; J, Zetek; 1 male, 1 

 female (48786). f.g. hs.-thoe 



^ ^ PANAMENSIS, FE- 



Perico Island; October 26, 1904; Albatross; 1 male male (48786), ba- 



(33390). "cLE.Tr''" 



Panama; May, 1863; Dr. Sternberg; 2 males, 2 



females (1945, M. C. Z.). 



Panama; A. Agassiz; 3 ovigerous females (988, M. C. Z.) ; identified 



by Stimpson as T. sulcata. 



THOE EROSA BeU 



Plate 249, figs. 1-6 



Thoe erosa Bell, Proc. Zool. Soc. London, vol. 3, 1835 (1836), p. 171 (type- 

 locality, Galapagos Islands; type not extant); Trans. Zool. Soc. London, 

 vol. 2, 1836, p. 48, pi. 9, figs. 4, 4 A--4 o.— Nobili, Boll. Mus. Zool. Anat. 

 Comp. R. Univ. Torino, vol. 16, No. 415, 1901, p. 30; not A. Milne 

 Edwards, Crust. R6g. Mex., 1875, pi. 19, figs. 4-4 d; 1878, p. 121, nor 

 Rathbun, Mem. Mus. Comp. Zool., vol. 35, 1907, p. 74. 



Diagnosis. — One anterior tooth or lobe on basal antennal segment. 

 Two rows of deep excavations on arm. Both fingers strongly 

 arcuate; gaping edges entire except for one tooth on dactyl. 



