278 BULLETIN 120, UNITED STATES NATIONAL MUSEUM 



are unarmed; a narrow slit separates the eaves from the postocular 

 teeth which are small, subtriangular, and hollowed within for the 

 reception of the eyes. Basal article of antennae long and narrow, 

 furnished usually with a tooth or spine at the antero-external angle; 

 and more or less exposed in dorsal view beside the rostrum. Merus 

 of outer maxilliped notched at inner angle; inner angle of ischium 

 strongly advanced. 



Chelipeds stout in old males, slender in females and undeveloped 

 males; merus three-sided; fingers sharp-pointed, finely denticulate 

 or crenulate and in contact in their terminal half. First pair of 

 ambulatory legs much longer than the others; second, third, and 

 fourth pairs diminishing successively in length, the last pair very 

 short. Leg^ margined with rows of stiff setae; merus much com- 

 pressed and having an acute upper edge; dactyli strongly curved, 

 corneous tips long and sharp. 



Not found outside of America, where it is distributed from south- 

 ern Massachusetts to St. Thomas, West Indies, from Cape St. Roque, 

 Brazil, to northern Patagonia, from Venice, California, to Panama, 

 and at the Galapagos Islands. 



KEY TO THE SPECIES OF THE GENUS PELIA 



A'. Rostrum not long, from one-fourth to two-fifths as long as remainder of 

 carapace. Basal article of antenna not more than half exposed in dorsal 

 view. 

 B'. Carapace elongate, its greatest width about two-thirds its greatest length. 

 Outer margins of rostral horns divergent or parallel. 

 C. Basal article of antenna half or nearly half exposed in dorsal view. 



D*. Carapace moderately high on the median line mutica, p. 278. 



D-. Carapace very high on the median line. Rostrum more defiexed, 



carapace wider at hepatic regions than in mutica^ .rotund&. p. 279. 



C^. Only the extremity bearing the spine or tooth of the basal article of 



antenna exposed in dorsal view tumida, p. 281. 



B^. Carapace broad, its greatest width about three-fourths its greatest length. 



paoifica, p. 283. 

 A^. Rostrum long, nearly half as long as remainder of carapace. Basal article 

 of antenna almost wholly exposed in dorsal view. (Bell.) 



pulchella, p. 284. 



Analogous species on opposite sides of the continent: mutica (At- 

 lantic) ; tumida (Pacific) . - 



PELIA MUTICA (Gibbes) 



Plate 98, figs. 2 and 3 



Pisa mutica Gibbes, Proc. Amer. Assoc. Adv. Sci., vol. 3, 1850, p. 171 [71 

 (type-locality, Charleston Harbor, off White Point Battery, S. C; type 

 not extant). 



Pelia mutica Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1860, p. 177. — 

 Smith, Rept. U. S. Commr. of Fisheries for 1871 and 1872 (1873), p- 

 548 [254].— A. Milne Edwards, Crust. Reg. Mex., 1875, p. 73, pi. 16^ 



