THE SPIDER CRABS OF AMERICA 



397 



of the segment; carpus with a few spines; a single spine on the pro- 

 podus midway of its length. 

 Measurements. — 



Locality 



Guadeloupe 



Do... 



Abrolhos Islands 



Culebra 



Do 



Pernambuco I S 



Indian Key ? 



Variations. — There is a great range in variation, (1) in the extent 

 of the tuberculation of the carapace, (2) in the size and sharpness 

 of the spines, related partly to age, (3) in the proportions of the 

 carapace. The female from Abrolhos Islands is vastly wider and 

 more completely tuberculated than any other specimen; this may be 

 due to its isolated habitat. The male from Pernambuco has much 

 stumpier rostral horns tlian any other specimen near its size. 



Range. — Florida Keys to Rio de Janeiro, Brazil. 



Material examined. — 



Indian Key, Florida; 1885; H. Hemphill; 1 female, immature, 

 holotype (15823). 



Ensenada Honda, Culebra, Porto Rico; February 9, 1899; Fisli 

 Hawk; 2 males, 1 female (24206). 



Guadeloupe; 1 male, 1 female (Geneva Mus.); labeled ^'tuher- 

 culatus". 



Rio Formoso, Pernambuco, Brazil; 1876-1877; R. Rathbun; 1 

 male (19956). 



Abrolhos Islands, Brazil; December 27, 1887; Albatross; 1 female 

 (21948). 



Rio de Janeiro; 1 female (Geneva Mus.). 



MITHRAX (MITHRAX) ORCUTTI, new species 



Plates 140 and 141 



Type-locality. — Puerto Angel, Oaxaca, Mexico; 1910; C. R. Orcutt; 

 1 mature female, holotype; Cat. No. 47110, U.S.N. M. 



Diagnosis. — A tubercle near proximal end of outer surface of palm. 

 Basal antennal segment without a row of spines parallel to the 

 marginal row. No spine on propodites of ambulatory legs. 



Description. — Coarsely pilose. Carapace, including spines, a little 

 longer than wide. While the surface is not closely paved with gran- 

 ules and tubercles as in pilosus and liemphilli, yet they are numerous 

 and very unequal and the granules are higher than in those species. 

 5487— 25t 27 



