OXYSTOMATOUS AND ALLIED CRABS OF AMERICA 79 



Ethusa mascarone (pars) Bouvier, Bull. Soc, Philom. Paris, ser. 8, vol. 9 (1896- 

 1897), p. 65, 1898. 



Diagnosis. — Eyestalks long, extending laterally beyond postorbital 

 spine. Carapace elongate, not much Mdder posteriorly then anteriorly. 



Description. — Carapace somewhat lyre-shaped; length about one- 

 fifth greater than width in male, one-seventh greater in female; sur- 

 face smooth and finely pubescent. Regions well marked; branchial 

 regions moderately swollen; they and the cardiac region are equally 

 high. Spine at antcro-external angle of carapace and at external end 

 of orbit, broad at base but tapering to slender and acute, and project- 

 ing obliquely forward as far as the line of the median sinus. The 

 divisions of the frontal teeth are sharp spines well separated and 

 equally advanced. Eyestalks long, rather slender, extending lat- 

 erally by the full length of the cornea beyond the antero-external 

 spines. Chelipeds equal, not strong, reaching to end of carpus of the 

 first leg; this leg reaches about to middle of dactylus of second leg; the 

 second pair in male is 2,5 times length of carapace, in female not so 

 long. 



Measurements. — Male (24518), entire length of carapace 7, width 

 5.8 mm.; female (17880), entire length of carapace 10.7, width 9.4 mm. 



Range. — North Carolina to Gulf of Mexico and West Indies. Gulf 

 of California; Taboga Island, Panama (Finnegan). Shallow water to 

 45 fathoms. 



Material examined. — See table 22, page 80. 



ETHUSA MASCARONE PANAMENSIS Finnegan 



Plate 22, Figure 1; Plate 23, Figure 1 



Ethusa mascarone americana Rathbun, Proc. U. S. Nat. Mus., vol. 21, p. 615, 



1898; not E. americana A. Milne Edwards. 

 Ethusa mascarone var. panamensis Finnegan, Journ. Linn. Soc. London, Zool., 



vol. 37, p. 616, 1931 (type locality, Perlas Island; type in Brit. Mus.). 



Diagnosis. — External-orbital spine shorter than any frontal teeth 

 and forwardly directed. Distance between tips of frontal teeth on 

 one side very little less than distance between tips of median pair. 



Remarks. — The specimens examined have a patch of fine granulations 

 on all the protuberances; only in the smaller specimen (22143) is 

 there evidence of the tubercles figured by Milne Edwards and 

 Bouvier; the tubercles are not sharp and the specimen is of the same 

 size as the type of E. americana. 



Measurements. — Female (66797), total length of carapace 9, width 

 8.5 mm. 



Range. — Mexico to Ecuador. 



Material examined. — See table 23, page 81. 



