Vol. XI, pp. 89-92 April 26, 1897 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



SYNOPSIS OF THE AMERICAN SESARM^, WITH 

 DESCRIPTION OF A NEW SPECIES.^ 



BY MARY J. RATH BUN. 



The American species of Scsarrna are in much confusion, owing 

 partly to incomplete descriptions and to the study of isolated 

 specimens. The following is a key to all the species known to 

 occur in America, with their })rincipal synonyms, hased on a 

 study of tyj^es. One new species is described from the Museum 

 at Copenhagen by permission of Dr. F. Meinert. 



Sesarma Say. 



Sy.nopsis op American Speciks. 



A. Carapace with a tooth beliiiid the outer orbital tooth. 

 B. Manus with two or more pectinated ridge.s on tlie upper surface. 



Subgenus Perisesanna de Man. afrkana^ * Milne Edwards. 



B^. Manus without pectinated ridges on the upper surface. 



Sul)genus Sesunna = Epinemrina de Man. 

 C. Front less than half the greatest width of the carapace. 



bidentata* Benedict. 

 G'. Front more than half the greatest width of the carapace. 

 D. Upper surface smooth. 

 E. Eyes reaching the outer angle of the orbit. 



curacaoensis de Man. 

 E'. Eyes not reaching the outer angle of the orbit. 



reticulata'^ Say. 



^ Published witli the permission of the Secretary of the Smithsonian 

 Institution. 



'^ Occurs at Barbados. 



* Tj'pe species of the genus. 



*Type examined by the writer. 



20— Biol. Soc. Wash., Vol. XI, 1897 (89) 



