THE SPIDER CRABS OF AMERICA 143 



tubercles; manus enlarged and compressed; fingers finely dentate, 

 gaping to the extremity in male, almost entirely closed in female. 

 Ambulatory legs with tufts of setae on extremities of articles; merus 

 and carpus with a few setiferous tubercles on anterior or upper 

 margin. Abdomen with fourth and fifth segments coalesced in 

 both sexes. 



Color. — Dark fawn-color (Milne Edwards and Lucas). 

 Measurements. — Male (40455), length of carapace to tip of horns 

 18.7, Avidth 12.5 mm. 



Variations.— X variable species. Ambulatory legs less cheliform in 

 females and young than in adult males. Propodites in the young 



(5 mm. long) only slightly enlarged. (See 

 Peltinia scutiformis.) Different names have 

 been given on the size of the male hand, the 

 development of the crest on the wrist, the 

 presence or obsolescence of tubercles on the 

 carapace, and other minor and age characters. 

 Range. — Southern Florida and the Baha- 

 mas to Rio de Janeiro; Lower California, 

 Mexico, to Valparaiso, Chile; Galapagos 

 Islands (Bell). Shallow water to 6 fathoms. 

 Material examined. — 



Miami, Florida: G. M. Gray; 1 male 

 (42150). 

 Harbor Island, Bahamas: July 8, 1893; 



Fig. 52.— ACANTHONYX PETIVERII r^. ,tt- -a. j>t -n T,- -. 1 



(40455), MAxiLLiPED, X 11.2 State University 01 Iowa Expedition; 1 male 



(18673), 2 males (Mus. S. U. I.). 

 Ensenada de Santa Rosa, Cuba: May 19, 1914; station 7; Tomas 

 Barrera Exped., Henderson and Bartsch; 1 male, 1 female (48670). 

 Port Royal Cayes, Jamaica: P. W. Jarvis; 1 young (19066). 

 Porto Rico; 1899; Fish. Hawlc: 1 young (24151). Arroyo; February 



3 and 4; 1 male, 2 females (24153). Arroyo, on lighthouse reef; 

 February 3; 1 female, 1 young (24152). 



St. Thomas, West Indies (Copenhagen Mus.). 



St. John, West Indies (Copenhagen Mus.). 



St. Croix, West Indies (Copenhagen Mus.). 



Fox Bay, Colon, Panama: January 20, 1912; Meek and Hildebrand, 

 Smithson. Biol. Surv.; 1 ovigerous female (56538). 



Klein Bonaire, Dutch West Indies; among coral rocks, in tide 

 pools;July 11, 1905; J.Boeke; 1 female (42959), 1 female (LeidenMus.). 



Curasao: Great Bay, Wacao; one-half fathom, among algae; Octo- 

 ber 3, 1905; 1 male (Leiden Mus.). Caracas Bay; April 8, 1920; 

 C. J. van der Horst; 8 males, 7 females (Amsterdam Mus.), 2 males, 

 2 females (56862). West Point; May 14, 1920; C. J. van der Horst; 



4 males, 2 females (1 ovigerous) (Amsterdam Mus.). 



