504 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxxi. 



iiropods have a very short ramus on a somewhat lonoer and miuh 

 stouter peduncle. The telson is slig'htly bilobed. 



Lemjth. — The hirgest males and females are about U mm. long. 



Ilahltat. — Numerous specimens were collected by Prof. J. F. 

 Tristan and. Prof. P. Biolley in January, 190«5, at Boca Jesus Maria, 

 Costa Rica, on mangroves in the nuid under trunks of trees. 



Cotypes.—Odi. No. 32688, U.S.N.M. 



The specific name refers to the place of capture. 



p:XPLANATrON OF PLATE XL 



a. s. female, a. i. male. Upper antenna of female, lower antenna of male. 



gn. L 2, male; gn, 1, 2, female. First and second trnathopods of male and female, 

 with portions of the same more highly magnitied. 



prp. 2, 4, 5, male. Parts of second and fourth and wliolc df fifth pencopods of 

 male. 



nr. 1, 2, male; ur. 8, female. First and second nropods of male, and third uropod 

 of female, the last also more highly magnitied. 



