THE SPIDER CRABS OF AMERICA 283 



West of Magdalena Bay; lat. 24° 58' 15" N.; long. 115° 53' 00" 

 W.; 36 fathoms; Coralline; temp. 64.3° F.; March 2. 1889; station 

 2989, Albatross; 1 male (16348), with abnormal rostrum. 



Magdalena Bay, Lower California: 1917; C. R. Orcutt; 1 female, 

 with Rhizocephalid parasite (50639). Lat. 24° 32' 00" N.; long. 

 111° 59' 00" W.; 12 fathoms; fne. gy. S.; May 2, 1888; station 2831, 

 Albatross; 1 male (21913). 



PELIA PACIFICA A. MUne Edwards 



Plate 98, fig. 1; plate 99, fig. 1 



Pelia pacifica A, Milne Edwards, Crust. R6g. Mex., 1875, p. 73, pi. 16, 

 figs. 3-3c (type-locality. Bay of Panama; type in Paris Mus.). — Rath- 

 bun, Harriman Alaska Exped., vol. 10, 1904, p. 174 (part); Mem. Mus. 

 Comp. Zool., vol. 35, 1907, p. 72 (part); Proc. U. S. Nat. Mus., vol. 38, 

 1910, p. 572 (part); not vol. 16, 1893, p. 90, nor vol. 21, 1898, p. 573. 



Diagnosis. — Greatest width of carapace about three-fourths its 

 greatest length. Outer margins of rostral horns converging ante- 

 riorly. Fingers of mature male unusually narrow^, gape corre- 

 spondingly wide. Frontal region moderately deflexed. 



Description. — Carapace shorter and more triangular than in any 

 of the preceding species, the rostrum being much shorter, not more 

 than one-fourth, in the old male, as long as remainder of carapace, its 

 outer margins converging anteriorly, thus carrying out the triangular 

 form of the carapace. Very little of the basal antennal article is 

 visible from above; its outer angle is tipped with a spine. 



The chelipeds in the well-developed male are stouter than in the 

 preceding species, and about as long as the first pair of ambulatory 

 legs; palm wider, varying from 0.72 (in the smaller specimen) to 0.81 

 (in the old) of its superior length; a little narrowed distally and 

 slightly constricted near the fixed finger; fingers widely gaping for 

 half or (in the old) two-thirds of their length, slender, the basal tooth 

 of the dactylus comparatively insignificant, the fixed finger arched 

 very markedly downward in the basal half, thus increasing the gape. 



Measurements. — Male (46077), length of carapace on median line 

 10.5, to end of horns 12.2, width of carapace 9.2 mm. 



Range. — From Manzanillo, Mexico, to Panama. 



Material examined. — 



Manzanillo, Colima, Mexico; on drifted pile; July 17, 1913; 

 C. R. Orcutt; 1 male, 1 female (46077). 



Perico Island, Panama; October 26, 1904; Albatross; 1 male, 1 

 female (33393), 1 female (M. C. Z.). 



Panama; May, 1869; Dr. Sternberg; 1 male (2043, M. C. Z.). 



