148 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



EPIALTUS BITUBERCULATUS Milne Edwards 



Plate 45, figs. 3 and 4 



Epialtus bituberculatus Milne Edwards, Hist. Nat. Crust., vol. 1, 1834, p. 

 345, pi. 15, fig. 11 (type-locality, Chile; type in Paris Mus.). — Gibbes, 

 Proc. Amer. Assoc, Adv. Sci., 3rd meeting, 1850, p. 173 [9]. — A. Milne 

 Edwards, Crust. R6g. Mex., 1878, p. 139 (part), pi. 27, figs. 1-ld, 2-2e, 

 3-3c.— Rathbun (part), Proc. U. S. Nat. Mus., vol. 17, 1894, p. 67; Bull. 

 U. S. Fish Comm., vol. 20, for 1900, pt. 2 (1901), p. 60; Harriman Alaska 

 Exped., vol. 10, 1904, p. 173. 



Epialtus affinis Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1859, p. 

 49 (type-locality, Indian River, Florida; type not extant); Bull. Mus. 

 Comp. Zool., vol. 2, 1871, p. 128. 



Diagnosis. — Rostrum simple. Lateral margin with a very shallow 

 sinus between the lobes. Preorbital angles obscure. Hand high. 



Description. — Carapace subpentagonal; 

 two tubercles on gastric region; two lateral 

 k)bes, one hepatic, the other branchial; 

 carapace widest across the branchial lobes; 

 anterior margin of hepatic lobes oblique. 

 Preorbital angles scarcely marked ; postor- 

 bital teeth minute. Rostrum triangular, 

 extremity simple, obtuse. (Fig. 53, a, h.) 

 Chelipeds of adult male strong. Inner 

 margin of merus and carpus laminate; two 

 crests on outer surface of carpus. Palm 

 very high at distal end, compressed, upper 

 edge acute. Dactylus with a very large 

 tooth in the gape of the fingers. Legs slen- 

 FiG. 54.-EPIALTUS BITUBERCULATUS, dcr, a tuf t of hairs ou lowcT bordcr of pcnul- 



M ALE (24849), MAXILLIPED, X 16 ,• , , ■ i ■ n 



timate article, occasionally occupying a 

 slight prominence. Body and appendages covered with a coat of 

 short, brown pubescence. Fourth and fifth abdominal somites united 

 in male, fourth, fifth and sixth in female. 



Measurements. — Male (19944), length of carapace 11.8, width 8.7 

 mm. 



Range. — From Indian River, Florida, to Desterro, Brazil; Chile 

 (Milne Edwards). 



Material examined. — 



Key West, Florida; February 4, 1901; B. A. Bean and W. H. King; 

 1 male, 2 females (24849). 



Porto Rico; 1899; Fish Hawk: Arroyo; February 3; 1 male, 5 young 

 (24157) ; on lighthouse reef, 1 young (24156). Fajardo; February 17; 

 1 female (24158). 



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

 Smithson. Biol. Surv.; 1 ovigerous female (56535). 



